diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/chrome/common/ipc_message_utils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/chrome/common/ipc_message_utils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,1334 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_COMMON_IPC_MESSAGE_UTILS_H_
+#define CHROME_COMMON_IPC_MESSAGE_UTILS_H_
+
+#include <string>
+#include <vector>
+#include <map>
+
+#include "base/file_path.h"
+#include "base/string_util.h"
+#include "base/string16.h"
+#include "base/tuple.h"
+#include "base/time.h"
+
+#if defined(OS_POSIX)
+#include "chrome/common/file_descriptor_set_posix.h"
+#endif
+#include "chrome/common/ipc_sync_message.h"
+#include "chrome/common/transport_dib.h"
+
+namespace IPC {
+
+//-----------------------------------------------------------------------------
+// An iterator class for reading the fields contained within a Message.
+
+class MessageIterator {
+ public:
+  explicit MessageIterator(const Message& m) : msg_(m), iter_(NULL) {
+  }
+  int NextInt() const {
+    int val;
+    if (!msg_.ReadInt(&iter_, &val))
+      NOTREACHED();
+    return val;
+  }
+  intptr_t NextIntPtr() const {
+    intptr_t val;
+    if (!msg_.ReadIntPtr(&iter_, &val))
+      NOTREACHED();
+    return val;
+  }
+  const std::string NextString() const {
+    std::string val;
+    if (!msg_.ReadString(&iter_, &val))
+      NOTREACHED();
+    return val;
+  }
+  const std::wstring NextWString() const {
+    std::wstring val;
+    if (!msg_.ReadWString(&iter_, &val))
+      NOTREACHED();
+    return val;
+  }
+  const void NextData(const char** data, int* length) const {
+    if (!msg_.ReadData(&iter_, data, length)) {
+      NOTREACHED();
+    }
+  }
+ private:
+  const Message& msg_;
+  mutable void* iter_;
+};
+
+//-----------------------------------------------------------------------------
+// ParamTraits specializations, etc.
+//
+// The full set of types ParamTraits is specialized upon contains *possibly*
+// repeated types: unsigned long may be uint32_t or size_t, unsigned long long
+// may be uint64_t or size_t, nsresult may be uint32_t, and so on.  You can't
+// have ParamTraits<unsigned int> *and* ParamTraits<uint32_t> if unsigned int
+// is uint32_t -- that's multiple definitions, and you can only have one.
+//
+// You could use #ifs and macro conditions to avoid duplicates, but they'd be
+// hairy: heavily dependent upon OS and compiler author choices, forced to
+// address all conflicts by hand.  Happily there's a better way.  The basic
+// idea looks like this, where T -> U represents T inheriting from U:
+//
+// class ParamTraits<P>
+// |
+// --> class ParamTraits1<P>
+//     |
+//     --> class ParamTraits2<P>
+//         |
+//         --> class ParamTraitsN<P> // or however many levels
+//
+// The default specialization of ParamTraits{M}<P> is an empty class that
+// inherits from ParamTraits{M + 1}<P> (or nothing in the base case).
+//
+// Now partition the set of parameter types into sets without duplicates.
+// Assign each set of types to a level M.  Then specialize ParamTraitsM for
+// each of those types.  A reference to ParamTraits<P> will consist of some
+// number of empty classes inheriting in sequence, ending in a non-empty
+// ParamTraits{N}<P>.  It's okay for the parameter types to be duplicative:
+// either name of a type will resolve to the same ParamTraits{N}<P>.
+//
+// The nice thing is that because templates are instantiated lazily, if we
+// indeed have uint32_t == unsigned int, say, with the former in level N and
+// the latter in M > N, ParamTraitsM<unsigned int> won't be created (as long as
+// nobody uses ParamTraitsM<unsigned int>, but why would you), and no duplicate
+// code will be compiled or extra symbols generated.  It's as efficient at
+// runtime as manually figuring out and avoiding conflicts by #ifs.
+//
+// The scheme we follow below names the various classes according to the types
+// in them, and the number of ParamTraits levels is larger, but otherwise it's
+// exactly the above idea.
+//
+
+template <class P> struct ParamTraits;
+
+template <class P>
+static inline void WriteParam(Message* m, const P& p) {
+  ParamTraits<P>::Write(m, p);
+}
+
+template <class P>
+static inline bool WARN_UNUSED_RESULT ReadParam(const Message* m, void** iter,
+                                                P* p) {
+  return ParamTraits<P>::Read(m, iter, p);
+}
+
+template <class P>
+static inline void LogParam(const P& p, std::wstring* l) {
+  ParamTraits<P>::Log(p, l);
+}
+
+// Fundamental types.
+
+template <class P>
+struct ParamTraitsFundamental {};
+
+template <>
+struct ParamTraitsFundamental<bool> {
+  typedef bool param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteBool(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadBool(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(p ? L"true" : L"false");
+  }
+};
+
+template <>
+struct ParamTraitsFundamental<int> {
+  typedef int param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteInt(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadInt(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%d", p));
+  }
+};
+
+template <>
+struct ParamTraitsFundamental<long> {
+  typedef long param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteLong(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadLong(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%l", p));
+  }
+};
+
+template <>
+struct ParamTraitsFundamental<unsigned long> {
+  typedef unsigned long param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteULong(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadULong(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%ul", p));
+  }
+};
+
+template <>
+struct ParamTraitsFundamental<long long> {
+  typedef long long param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteData(reinterpret_cast<const char*>(&p), sizeof(param_type));
+ }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    bool result = m->ReadData(iter, &data, &data_size);
+    if (result && data_size == sizeof(param_type)) {
+      memcpy(r, data, sizeof(param_type));
+    } else {
+      result = false;
+      NOTREACHED();
+    }
+    return result;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%ll", p));
+  }
+};
+
+template <>
+struct ParamTraitsFundamental<unsigned long long> {
+  typedef unsigned long long param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteData(reinterpret_cast<const char*>(&p), sizeof(param_type));
+ }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    bool result = m->ReadData(iter, &data, &data_size);
+    if (result && data_size == sizeof(param_type)) {
+      memcpy(r, data, sizeof(param_type));
+    } else {
+      result = false;
+      NOTREACHED();
+    }
+    return result;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%ull", p));
+  }
+};
+
+template <>
+struct ParamTraitsFundamental<double> {
+  typedef double param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteData(reinterpret_cast<const char*>(&p), sizeof(param_type));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    bool result = m->ReadData(iter, &data, &data_size);
+    if (result && data_size == sizeof(param_type)) {
+      memcpy(r, data, sizeof(param_type));
+    } else {
+      result = false;
+      NOTREACHED();
+    }
+
+    return result;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"e", p));
+  }
+};
+
+// Fixed-size <stdint.h> types.
+
+template <class P>
+struct ParamTraitsFixed : ParamTraitsFundamental<P> {};
+
+template <>
+struct ParamTraitsFixed<int16_t> {
+  typedef int16_t param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteInt16(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadInt16(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%hd", p));
+  }
+};
+
+template <>
+struct ParamTraitsFixed<uint16_t> {
+  typedef uint16_t param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteUInt16(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadUInt16(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%hu", p));
+  }
+};
+
+template <>
+struct ParamTraitsFixed<uint32_t> {
+  typedef uint32_t param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteUInt32(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadUInt32(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%u", p));
+  }
+};
+
+template <>
+struct ParamTraitsFixed<int64_t> {
+  typedef int64_t param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteInt64(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadInt64(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%" PRId64L, p));
+  }
+};
+
+template <>
+struct ParamTraitsFixed<uint64_t> {
+  typedef uint64_t param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteInt64(static_cast<int64_t>(p));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadInt64(iter, reinterpret_cast<int64_t*>(r));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%" PRIu64L, p));
+  }
+};
+
+// Other standard C types.
+
+template <class P>
+struct ParamTraitsLibC : ParamTraitsFixed<P> {};
+
+template <>
+struct ParamTraitsLibC<size_t> {
+  typedef size_t param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteSize(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadSize(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%u", p));
+  }
+};
+
+// std::* types.
+
+template <class P>
+struct ParamTraitsStd : ParamTraitsLibC<P> {};
+
+template <>
+struct ParamTraitsStd<std::string> {
+  typedef std::string param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteString(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadString(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(UTF8ToWide(p));
+  }
+};
+
+template <>
+struct ParamTraitsStd<std::wstring> {
+  typedef std::wstring param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteWString(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadWString(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(p);
+  }
+};
+
+template <>
+struct ParamTraitsStd<std::vector<unsigned char> > {
+  typedef std::vector<unsigned char> param_type;
+  static void Write(Message* m, const param_type& p) {
+    if (p.size() == 0) {
+      m->WriteData(NULL, 0);
+    } else {
+      m->WriteData(reinterpret_cast<const char*>(&p.front()),
+                   static_cast<int>(p.size()));
+    }
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    if (!m->ReadData(iter, &data, &data_size) || data_size < 0)
+      return false;
+    r->resize(data_size);
+    if (data_size)
+      memcpy(&r->front(), data, data_size);
+    return true;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    for (size_t i = 0; i < p.size(); ++i)
+      l->push_back(p[i]);
+  }
+};
+
+template <>
+struct ParamTraitsStd<std::vector<char> > {
+  typedef std::vector<char> param_type;
+  static void Write(Message* m, const param_type& p) {
+    if (p.size() == 0) {
+      m->WriteData(NULL, 0);
+    } else {
+      m->WriteData(&p.front(), static_cast<int>(p.size()));
+    }
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    if (!m->ReadData(iter, &data, &data_size) || data_size < 0)
+      return false;
+    r->resize(data_size);
+    if (data_size)
+      memcpy(&r->front(), data, data_size);
+    return true;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    for (size_t i = 0; i < p.size(); ++i)
+      l->push_back(p[i]);
+  }
+};
+
+template <class P>
+struct ParamTraitsStd<std::vector<P> > {
+  typedef std::vector<P> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, static_cast<int>(p.size()));
+    for (size_t i = 0; i < p.size(); i++)
+      WriteParam(m, p[i]);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    int size;
+    if (!m->ReadLength(iter, &size))
+      return false;
+    // Resizing beforehand is not safe, see BUG 1006367 for details.
+    if (m->IteratorHasRoomFor(*iter, size * sizeof(P))) {
+      r->resize(size);
+      for (int i = 0; i < size; i++) {
+        if (!ReadParam(m, iter, &(*r)[i]))
+          return false;
+      }
+    } else {
+      for (int i = 0; i < size; i++) {
+        P element;
+        if (!ReadParam(m, iter, &element))
+          return false;
+        r->push_back(element);
+      }
+    }
+    return true;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    for (size_t i = 0; i < p.size(); ++i) {
+      if (i != 0)
+        l->append(L" ");
+
+      LogParam((p[i]), l);
+    }
+  }
+};
+
+template <class K, class V>
+struct ParamTraitsStd<std::map<K, V> > {
+  typedef std::map<K, V> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, static_cast<int>(p.size()));
+    typename param_type::const_iterator iter;
+    for (iter = p.begin(); iter != p.end(); ++iter) {
+      WriteParam(m, iter->first);
+      WriteParam(m, iter->second);
+    }
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    int size;
+    if (!ReadParam(m, iter, &size) || size < 0)
+      return false;
+    for (int i = 0; i < size; ++i) {
+      K k;
+      if (!ReadParam(m, iter, &k))
+        return false;
+      V& value = (*r)[k];
+      if (!ReadParam(m, iter, &value))
+        return false;
+    }
+    return true;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(L"<std::map>");
+  }
+};
+
+// Windows-specific types.
+
+template <class P>
+struct ParamTraitsWindows : ParamTraitsStd<P> {};
+
+#if defined(OS_WIN)
+template <>
+struct ParamTraitsWindows<LOGFONT> {
+  typedef LOGFONT param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteData(reinterpret_cast<const char*>(&p), sizeof(LOGFONT));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    bool result = m->ReadData(iter, &data, &data_size);
+    if (result && data_size == sizeof(LOGFONT)) {
+      memcpy(r, data, sizeof(LOGFONT));
+    } else {
+      result = false;
+      NOTREACHED();
+    }
+
+    return result;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"<LOGFONT>"));
+  }
+};
+
+template <>
+struct ParamTraitsWindows<MSG> {
+  typedef MSG param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteData(reinterpret_cast<const char*>(&p), sizeof(MSG));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    bool result = m->ReadData(iter, &data, &data_size);
+    if (result && data_size == sizeof(MSG)) {
+      memcpy(r, data, sizeof(MSG));
+    } else {
+      result = false;
+      NOTREACHED();
+    }
+
+    return result;
+  }
+};
+
+template <>
+struct ParamTraitsWindows<HANDLE> {
+  typedef HANDLE param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteIntPtr(reinterpret_cast<intptr_t>(p));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    DCHECK_EQ(sizeof(param_type), sizeof(intptr_t));
+    return m->ReadIntPtr(iter, reinterpret_cast<intptr_t*>(r));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"0x%X", p));
+  }
+};
+
+template <>
+struct ParamTraitsWindows<HCURSOR> {
+  typedef HCURSOR param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteIntPtr(reinterpret_cast<intptr_t>(p));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    DCHECK_EQ(sizeof(param_type), sizeof(intptr_t));
+    return m->ReadIntPtr(iter, reinterpret_cast<intptr_t*>(r));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"0x%X", p));
+  }
+};
+
+template <>
+struct ParamTraitsWindows<HWND> {
+  typedef HWND param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteIntPtr(reinterpret_cast<intptr_t>(p));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    DCHECK_EQ(sizeof(param_type), sizeof(intptr_t));
+    return m->ReadIntPtr(iter, reinterpret_cast<intptr_t*>(r));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"0x%X", p));
+  }
+};
+
+template <>
+struct ParamTraitsWindows<HACCEL> {
+  typedef HACCEL param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteIntPtr(reinterpret_cast<intptr_t>(p));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    DCHECK_EQ(sizeof(param_type), sizeof(intptr_t));
+    return m->ReadIntPtr(iter, reinterpret_cast<intptr_t*>(r));
+  }
+};
+
+template <>
+struct ParamTraitsWindows<POINT> {
+  typedef POINT param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteInt(p.x);
+    m->WriteInt(p.y);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    int x, y;
+    if (!m->ReadInt(iter, &x) || !m->ReadInt(iter, &y))
+      return false;
+    r->x = x;
+    r->y = y;
+    return true;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"(%d, %d)", p.x, p.y));
+  }
+};
+
+template <>
+struct ParamTraitsWindows<XFORM> {
+  typedef XFORM param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteData(reinterpret_cast<const char*>(&p), sizeof(XFORM));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    const char *data;
+    int data_size = 0;
+    bool result = m->ReadData(iter, &data, &data_size);
+    if (result && data_size == sizeof(XFORM)) {
+      memcpy(r, data, sizeof(XFORM));
+    } else {
+      result = false;
+      NOTREACHED();
+    }
+
+    return result;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(L"<XFORM>");
+  }
+};
+#endif  // defined(OS_WIN)
+
+// Various ipc/chromium types.
+
+template <class P>
+struct ParamTraitsIPC : ParamTraitsWindows<P> {};
+
+template <>
+struct ParamTraitsIPC<base::Time> {
+  typedef base::Time param_type;
+  static inline void Write(Message* m, const param_type& p);
+  static inline bool Read(const Message* m, void** iter, param_type* r);
+  static inline void Log(const param_type& p, std::wstring* l);
+};
+
+#if defined(OS_POSIX)
+// FileDescriptors may be serialised over IPC channels on POSIX. On the
+// receiving side, the FileDescriptor is a valid duplicate of the file
+// descriptor which was transmitted: *it is not just a copy of the integer like
+// HANDLEs on Windows*. The only exception is if the file descriptor is < 0. In
+// this case, the receiving end will see a value of -1. *Zero is a valid file
+// descriptor*.
+//
+// The received file descriptor will have the |auto_close| flag set to true. The
+// code which handles the message is responsible for taking ownership of it.
+// File descriptors are OS resources and must be closed when no longer needed.
+//
+// When sending a file descriptor, the file descriptor must be valid at the time
+// of transmission. Since transmission is not synchronous, one should consider
+// dup()ing any file descriptors to be transmitted and setting the |auto_close|
+// flag, which causes the file descriptor to be closed after writing.
+template<>
+struct ParamTraitsIPC<base::FileDescriptor> {
+  typedef base::FileDescriptor param_type;
+  static void Write(Message* m, const param_type& p) {
+    const bool valid = p.fd >= 0;
+    WriteParam(m, valid);
+
+    if (valid) {
+      if (!m->WriteFileDescriptor(p)) {
+        NOTREACHED() << "Too many file descriptors for one message!";
+      }
+    }
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    bool valid;
+    if (!ReadParam(m, iter, &valid))
+      return false;
+
+    if (!valid) {
+      r->fd = -1;
+      r->auto_close = false;
+      return true;
+    }
+
+    return m->ReadFileDescriptor(iter, r);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    if (p.auto_close) {
+      l->append(StringPrintf(L"FD(%d auto-close)", p.fd));
+    } else {
+      l->append(StringPrintf(L"FD(%d)", p.fd));
+    }
+  }
+};
+#endif // defined(OS_POSIX)
+
+template <>
+struct ParamTraitsIPC<FilePath> {
+  typedef FilePath param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* r);
+  static void Log(const param_type& p, std::wstring* l);
+};
+
+struct LogData {
+  std::wstring channel;
+  int32_t routing_id;
+  uint16_t type;
+  std::wstring flags;
+  int64_t sent;  // Time that the message was sent (i.e. at Send()).
+  int64_t receive;  // Time before it was dispatched (i.e. before calling
+                  // OnMessageReceived).
+  int64_t dispatch;  // Time after it was dispatched (i.e. after calling
+                   // OnMessageReceived).
+  std::wstring message_name;
+  std::wstring params;
+};
+
+template <>
+struct ParamTraitsIPC<LogData> {
+  typedef LogData param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.channel);
+    WriteParam(m, p.routing_id);
+    WriteParam(m, static_cast<int>(p.type));
+    WriteParam(m, p.flags);
+    WriteParam(m, p.sent);
+    WriteParam(m, p.receive);
+    WriteParam(m, p.dispatch);
+    WriteParam(m, p.params);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    int type = 0;
+    bool result =
+      ReadParam(m, iter, &r->channel) &&
+      ReadParam(m, iter, &r->routing_id) &&
+      ReadParam(m, iter, &type) &&
+      ReadParam(m, iter, &r->flags) &&
+      ReadParam(m, iter, &r->sent) &&
+      ReadParam(m, iter, &r->receive) &&
+      ReadParam(m, iter, &r->dispatch) &&
+      ReadParam(m, iter, &r->params);
+    r->type = static_cast<uint16_t>(type);
+    return result;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    // Doesn't make sense to implement this!
+  }
+};
+
+#if defined(OS_WIN)
+template<>
+struct ParamTraitsIPC<TransportDIB::Id> {
+  typedef TransportDIB::Id param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.handle);
+    WriteParam(m, p.sequence_num);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return (ReadParam(m, iter, &r->handle) &&
+            ReadParam(m, iter, &r->sequence_num));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(L"TransportDIB(");
+    LogParam(p.handle, l);
+    l->append(L", ");
+    LogParam(p.sequence_num, l);
+    l->append(L")");
+  }
+};
+#endif
+
+template <>
+struct ParamTraitsIPC<Message> {
+  static void Write(Message* m, const Message& p) {
+    m->WriteInt(p.size());
+    m->WriteData(reinterpret_cast<const char*>(p.data()), p.size());
+  }
+  static bool Read(const Message* m, void** iter, Message* r) {
+    int size;
+    if (!m->ReadInt(iter, &size))
+      return false;
+    const char* data;
+    if (!m->ReadData(iter, &data, &size))
+      return false;
+    *r = Message(data, size);
+    return true;
+  }
+  static void Log(const Message& p, std::wstring* l) {
+    l->append(L"<IPC::Message>");
+  }
+};
+
+template <>
+struct ParamTraitsIPC<Tuple0> {
+  typedef Tuple0 param_type;
+  static void Write(Message* m, const param_type& p) {
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return true;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+  }
+};
+
+template <class A>
+struct ParamTraitsIPC< Tuple1<A> > {
+  typedef Tuple1<A> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.a);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return ReadParam(m, iter, &r->a);
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    LogParam(p.a, l);
+  }
+};
+
+template <class A, class B>
+struct ParamTraitsIPC< Tuple2<A, B> > {
+  typedef Tuple2<A, B> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.a);
+    WriteParam(m, p.b);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return (ReadParam(m, iter, &r->a) &&
+            ReadParam(m, iter, &r->b));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    LogParam(p.a, l);
+    l->append(L", ");
+    LogParam(p.b, l);
+  }
+};
+
+template <class A, class B, class C>
+struct ParamTraitsIPC< Tuple3<A, B, C> > {
+  typedef Tuple3<A, B, C> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.a);
+    WriteParam(m, p.b);
+    WriteParam(m, p.c);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return (ReadParam(m, iter, &r->a) &&
+            ReadParam(m, iter, &r->b) &&
+            ReadParam(m, iter, &r->c));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    LogParam(p.a, l);
+    l->append(L", ");
+    LogParam(p.b, l);
+    l->append(L", ");
+    LogParam(p.c, l);
+  }
+};
+
+template <class A, class B, class C, class D>
+struct ParamTraitsIPC< Tuple4<A, B, C, D> > {
+  typedef Tuple4<A, B, C, D> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.a);
+    WriteParam(m, p.b);
+    WriteParam(m, p.c);
+    WriteParam(m, p.d);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return (ReadParam(m, iter, &r->a) &&
+            ReadParam(m, iter, &r->b) &&
+            ReadParam(m, iter, &r->c) &&
+            ReadParam(m, iter, &r->d));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    LogParam(p.a, l);
+    l->append(L", ");
+    LogParam(p.b, l);
+    l->append(L", ");
+    LogParam(p.c, l);
+    l->append(L", ");
+    LogParam(p.d, l);
+  }
+};
+
+template <class A, class B, class C, class D, class E>
+struct ParamTraitsIPC< Tuple5<A, B, C, D, E> > {
+  typedef Tuple5<A, B, C, D, E> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.a);
+    WriteParam(m, p.b);
+    WriteParam(m, p.c);
+    WriteParam(m, p.d);
+    WriteParam(m, p.e);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return (ReadParam(m, iter, &r->a) &&
+            ReadParam(m, iter, &r->b) &&
+            ReadParam(m, iter, &r->c) &&
+            ReadParam(m, iter, &r->d) &&
+            ReadParam(m, iter, &r->e));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    LogParam(p.a, l);
+    l->append(L", ");
+    LogParam(p.b, l);
+    l->append(L", ");
+    LogParam(p.c, l);
+    l->append(L", ");
+    LogParam(p.d, l);
+    l->append(L", ");
+    LogParam(p.e, l);
+  }
+};
+
+template <class A, class B, class C, class D, class E, class F>
+struct ParamTraitsIPC< Tuple6<A, B, C, D, E, F> > {
+  typedef Tuple6<A, B, C, D, E, F> param_type;
+  static void Write(Message* m, const param_type& p) {
+    WriteParam(m, p.a);
+    WriteParam(m, p.b);
+    WriteParam(m, p.c);
+    WriteParam(m, p.d);
+    WriteParam(m, p.e);
+    WriteParam(m, p.f);
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return (ReadParam(m, iter, &r->a) &&
+            ReadParam(m, iter, &r->b) &&
+            ReadParam(m, iter, &r->c) &&
+            ReadParam(m, iter, &r->d) &&
+            ReadParam(m, iter, &r->e) &&
+            ReadParam(m, iter, &r->f));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    LogParam(p.a, l);
+    l->append(L", ");
+    LogParam(p.b, l);
+    l->append(L", ");
+    LogParam(p.c, l);
+    l->append(L", ");
+    LogParam(p.d, l);
+    l->append(L", ");
+    LogParam(p.e, l);
+    l->append(L", ");
+    LogParam(p.f, l);
+  }
+};
+
+// Mozilla-specific types.
+
+template <class P>
+struct ParamTraitsMozilla : ParamTraitsIPC<P> {};
+
+template <>
+struct ParamTraitsMozilla<nsresult> {
+  typedef nsresult param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteUInt32(static_cast<uint32_t>(p));
+  }
+  static bool Read(const Message* m, void** iter, param_type* r) {
+    return m->ReadUInt32(iter, reinterpret_cast<uint32_t*>(r));
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    l->append(StringPrintf(L"%u", static_cast<uint32_t>(p)));
+  }
+};
+
+// Finally, ParamTraits itself.
+
+template <class P> struct ParamTraits : ParamTraitsMozilla<P> {};
+
+// Now go back and define inlines dependent upon various ParamTraits<P>.
+inline void
+ParamTraitsIPC<base::Time>::Write(Message* m, const param_type& p) {
+  ParamTraits<int64_t>::Write(m, p.ToInternalValue());
+}
+inline bool
+ParamTraitsIPC<base::Time>::Read(const Message* m, void** iter, param_type* r) {
+  int64_t value;
+  if (!ParamTraits<int64_t>::Read(m, iter, &value))
+    return false;
+  *r = base::Time::FromInternalValue(value);
+  return true;
+}
+inline void
+ParamTraitsIPC<base::Time>::Log(const param_type& p, std::wstring* l) {
+  ParamTraits<int64_t>::Log(p.ToInternalValue(), l);
+}
+
+inline void
+ParamTraitsIPC<FilePath>::Write(Message* m, const param_type& p) {
+  ParamTraits<FilePath::StringType>::Write(m, p.value());
+}
+inline bool
+ParamTraitsIPC<FilePath>::Read(const Message* m, void** iter, param_type* r) {
+  FilePath::StringType value;
+  if (!ParamTraits<FilePath::StringType>::Read(m, iter, &value))
+    return false;
+  *r = FilePath(value);
+  return true;
+}
+inline void
+ParamTraitsIPC<FilePath>::Log(const param_type& p, std::wstring* l) {
+  ParamTraits<FilePath::StringType>::Log(p.value(), l);
+}
+
+//-----------------------------------------------------------------------------
+// Generic message subclasses
+
+// Used for asynchronous messages.
+template <class ParamType>
+class MessageWithTuple : public Message {
+ public:
+  typedef ParamType Param;
+
+  MessageWithTuple(int32_t routing_id, uint16_t type, const Param& p)
+      : Message(routing_id, type, PRIORITY_NORMAL) {
+    WriteParam(this, p);
+  }
+
+  static bool Read(const Message* msg, Param* p) {
+    void* iter = NULL;
+    bool rv = ReadParam(msg, &iter, p);
+    DCHECK(rv) << "Error deserializing message " << msg->type();
+    return rv;
+  }
+
+  // Generic dispatcher.  Should cover most cases.
+  template<class T, class Method>
+  static bool Dispatch(const Message* msg, T* obj, Method func) {
+    Param p;
+    if (Read(msg, &p)) {
+      DispatchToMethod(obj, func, p);
+      return true;
+    }
+    return false;
+  }
+
+  // The following dispatchers exist for the case where the callback function
+  // needs the message as well.  They assume that "Param" is a type of Tuple
+  // (except the one arg case, as there is no Tuple1).
+  template<class T, typename TA>
+  static bool Dispatch(const Message* msg, T* obj,
+                       void (T::*func)(const Message&, TA)) {
+    Param p;
+    if (Read(msg, &p)) {
+      (obj->*func)(*msg, p);
+      return true;
+    }
+    return false;
+  }
+
+  template<class T, typename TA, typename TB>
+  static bool Dispatch(const Message* msg, T* obj,
+                       void (T::*func)(const Message&, TA, TB)) {
+    Param p;
+    if (Read(msg, &p)) {
+      (obj->*func)(*msg, p.a, p.b);
+      return true;
+    }
+    return false;
+  }
+
+  template<class T, typename TA, typename TB, typename TC>
+  static bool Dispatch(const Message* msg, T* obj,
+                       void (T::*func)(const Message&, TA, TB, TC)) {
+    Param p;
+    if (Read(msg, &p)) {
+      (obj->*func)(*msg, p.a, p.b, p.c);
+      return true;
+    }
+    return false;
+  }
+
+  template<class T, typename TA, typename TB, typename TC, typename TD>
+  static bool Dispatch(const Message* msg, T* obj,
+                       void (T::*func)(const Message&, TA, TB, TC, TD)) {
+    Param p;
+    if (Read(msg, &p)) {
+      (obj->*func)(*msg, p.a, p.b, p.c, p.d);
+      return true;
+    }
+    return false;
+  }
+
+  template<class T, typename TA, typename TB, typename TC, typename TD,
+           typename TE>
+  static bool Dispatch(const Message* msg, T* obj,
+                       void (T::*func)(const Message&, TA, TB, TC, TD, TE)) {
+    Param p;
+    if (Read(msg, &p)) {
+      (obj->*func)(*msg, p.a, p.b, p.c, p.d, p.e);
+      return true;
+    }
+    return false;
+  }
+
+  static void Log(const Message* msg, std::wstring* l) {
+    Param p;
+    if (Read(msg, &p))
+      LogParam(p, l);
+  }
+
+  // Functions used to do manual unpacking.  Only used by the automation code,
+  // these should go away once that code uses SyncChannel.
+  template<typename TA, typename TB>
+  static bool Read(const IPC::Message* msg, TA* a, TB* b) {
+    ParamType params;
+    if (!Read(msg, &params))
+      return false;
+    *a = params.a;
+    *b = params.b;
+    return true;
+  }
+
+  template<typename TA, typename TB, typename TC>
+  static bool Read(const IPC::Message* msg, TA* a, TB* b, TC* c) {
+    ParamType params;
+    if (!Read(msg, &params))
+      return false;
+    *a = params.a;
+    *b = params.b;
+    *c = params.c;
+    return true;
+  }
+
+  template<typename TA, typename TB, typename TC, typename TD>
+  static bool Read(const IPC::Message* msg, TA* a, TB* b, TC* c, TD* d) {
+    ParamType params;
+    if (!Read(msg, &params))
+      return false;
+    *a = params.a;
+    *b = params.b;
+    *c = params.c;
+    *d = params.d;
+    return true;
+  }
+
+  template<typename TA, typename TB, typename TC, typename TD, typename TE>
+  static bool Read(const IPC::Message* msg, TA* a, TB* b, TC* c, TD* d, TE* e) {
+    ParamType params;
+    if (!Read(msg, &params))
+      return false;
+    *a = params.a;
+    *b = params.b;
+    *c = params.c;
+    *d = params.d;
+    *e = params.e;
+    return true;
+  }
+};
+
+// This class assumes that its template argument is a RefTuple (a Tuple with
+// reference elements).
+template <class RefTuple>
+class ParamDeserializer : public MessageReplyDeserializer {
+ public:
+  explicit ParamDeserializer(const RefTuple& out) : out_(out) { }
+
+  bool SerializeOutputParameters(const IPC::Message& msg, void* iter) {
+    return ReadParam(&msg, &iter, &out_);
+  }
+
+  RefTuple out_;
+};
+
+// defined in ipc_logging.cc
+void GenerateLogData(const std::wstring& channel, const Message& message,
+                     LogData* data);
+
+// Used for synchronous messages.
+template <class SendParamType, class ReplyParamType>
+class MessageWithReply : public SyncMessage {
+ public:
+  typedef SendParamType SendParam;
+  typedef ReplyParamType ReplyParam;
+
+  MessageWithReply(int32_t routing_id, uint16_t type,
+                   const SendParam& send, const ReplyParam& reply)
+      : SyncMessage(routing_id, type, PRIORITY_NORMAL,
+                    new ParamDeserializer<ReplyParam>(reply)) {
+    WriteParam(this, send);
+  }
+
+  static void Log(const Message* msg, std::wstring* l) {
+    if (msg->is_sync()) {
+      SendParam p;
+      void* iter = SyncMessage::GetDataIterator(msg);
+      if (ReadParam(msg, &iter, &p))
+        LogParam(p, l);
+
+#if defined(IPC_MESSAGE_LOG_ENABLED)
+      const std::wstring& output_params = msg->output_params();
+      if (!l->empty() && !output_params.empty())
+        l->append(L", ");
+
+      l->append(output_params);
+#endif
+    } else {
+      // This is an outgoing reply.  Now that we have the output parameters, we
+      // can finally log the message.
+      typename ReplyParam::ValueTuple p;
+      void* iter = SyncMessage::GetDataIterator(msg);
+      if (ReadParam(msg, &iter, &p))
+        LogParam(p, l);
+    }
+  }
+
+  template<class T, class Method>
+  static bool Dispatch(const Message* msg, T* obj, Method func) {
+    SendParam send_params;
+    void* iter = GetDataIterator(msg);
+    Message* reply = GenerateReply(msg);
+    bool error;
+    if (ReadParam(msg, &iter, &send_params)) {
+      typename ReplyParam::ValueTuple reply_params;
+      DispatchToMethod(obj, func, send_params, &reply_params);
+      WriteParam(reply, reply_params);
+      error = false;
+#ifdef IPC_MESSAGE_LOG_ENABLED
+      if (msg->received_time() != 0) {
+        std::wstring output_params;
+        LogParam(reply_params, &output_params);
+        msg->set_output_params(output_params);
+      }
+#endif
+    } else {
+      NOTREACHED() << "Error deserializing message " << msg->type();
+      reply->set_reply_error();
+      error = true;
+    }
+
+    obj->Send(reply);
+    return !error;
+  }
+
+  template<class T, class Method>
+  static bool DispatchDelayReply(const Message* msg, T* obj, Method func) {
+    SendParam send_params;
+    void* iter = GetDataIterator(msg);
+    Message* reply = GenerateReply(msg);
+    bool error;
+    if (ReadParam(msg, &iter, &send_params)) {
+      Tuple1<Message&> t = MakeRefTuple(*reply);
+
+#ifdef IPC_MESSAGE_LOG_ENABLED
+      if (msg->sent_time()) {
+        // Don't log the sync message after dispatch, as we don't have the
+        // output parameters at that point.  Instead, save its data and log it
+        // with the outgoing reply message when it's sent.
+        LogData* data = new LogData;
+        GenerateLogData(L"", *msg, data);
+        msg->set_dont_log();
+        reply->set_sync_log_data(data);
+      }
+#endif
+      DispatchToMethod(obj, func, send_params, &t);
+      error = false;
+    } else {
+      NOTREACHED() << "Error deserializing message " << msg->type();
+      reply->set_reply_error();
+      obj->Send(reply);
+      error = true;
+    }
+    return !error;
+  }
+
+  template<typename TA>
+  static void WriteReplyParams(Message* reply, TA a) {
+    ReplyParam p(a);
+    WriteParam(reply, p);
+  }
+
+  template<typename TA, typename TB>
+  static void WriteReplyParams(Message* reply, TA a, TB b) {
+    ReplyParam p(a, b);
+    WriteParam(reply, p);
+  }
+
+  template<typename TA, typename TB, typename TC>
+  static void WriteReplyParams(Message* reply, TA a, TB b, TC c) {
+    ReplyParam p(a, b, c);
+    WriteParam(reply, p);
+  }
+
+  template<typename TA, typename TB, typename TC, typename TD>
+  static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d) {
+    ReplyParam p(a, b, c, d);
+    WriteParam(reply, p);
+  }
+
+  template<typename TA, typename TB, typename TC, typename TD, typename TE>
+  static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d, TE e) {
+    ReplyParam p(a, b, c, d, e);
+    WriteParam(reply, p);
+  }
+};
+
+//-----------------------------------------------------------------------------
+
+}  // namespace IPC
+
+#endif  // CHROME_COMMON_IPC_MESSAGE_UTILS_H_