diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/debug_util_posix.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/debug_util_posix.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,187 @@
+// Copyright (c) 2006-2009 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.
+
+#include "build/build_config.h"
+#include "base/debug_util.h"
+
+#define MOZ_HAVE_EXECINFO_H (defined(OS_LINUX) && !defined(ANDROID))
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <limits.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <unistd.h>
+#if MOZ_HAVE_EXECINFO_H
+#include <execinfo.h>
+#endif
+
+#if defined(OS_MACOSX) || defined(OS_BSD)
+#if defined(OS_OPENBSD)
+#include <sys/proc.h>
+#endif
+#include <sys/sysctl.h>
+#endif
+
+#if defined(OS_DRAGONFLY) || defined(OS_FREEBSD)
+#include <sys/user.h>
+#endif
+
+#include "base/basictypes.h"
+#include "base/eintr_wrapper.h"
+#include "base/logging.h"
+#include "base/scoped_ptr.h"
+#include "base/string_piece.h"
+
+#if defined(OS_NETBSD)
+#undef KERN_PROC
+#define KERN_PROC KERN_PROC2
+#define KINFO_PROC struct kinfo_proc2
+#else
+#define KINFO_PROC struct kinfo_proc
+#endif
+
+#if defined(OS_MACOSX)
+#define KP_FLAGS kp_proc.p_flag
+#elif defined(OS_DRAGONFLY)
+#define KP_FLAGS kp_flags
+#elif defined(OS_FREEBSD)
+#define KP_FLAGS ki_flag
+#elif defined(OS_OPENBSD) && !defined(_P_TRACED)
+#define KP_FLAGS p_psflags
+#define P_TRACED PS_TRACED
+#else
+#define KP_FLAGS p_flag
+#endif
+
+// static
+bool DebugUtil::SpawnDebuggerOnProcess(unsigned /* process_id */) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
+#if defined(OS_MACOSX) || defined(OS_BSD)
+
+// Based on Apple's recommended method as described in
+// http://developer.apple.com/qa/qa2004/qa1361.html
+// static
+bool DebugUtil::BeingDebugged() {
+  // If the process is sandboxed then we can't use the sysctl, so cache the
+  // value.
+  static bool is_set = false;
+  static bool being_debugged = false;
+
+  if (is_set) {
+    return being_debugged;
+  }
+
+  // Initialize mib, which tells sysctl what info we want.  In this case,
+  // we're looking for information about a specific process ID.
+  int mib[] = {
+    CTL_KERN,
+    KERN_PROC,
+    KERN_PROC_PID,
+    getpid(),
+#if defined(OS_NETBSD) || defined(OS_OPENBSD)
+    sizeof(KINFO_PROC),
+    1,
+#endif
+  };
+
+  // Caution: struct kinfo_proc is marked __APPLE_API_UNSTABLE.  The source and
+  // binary interfaces may change.
+  KINFO_PROC info;
+  size_t info_size = sizeof(info);
+
+  int sysctl_result = sysctl(mib, arraysize(mib), &info, &info_size, NULL, 0);
+  DCHECK(sysctl_result == 0);
+  if (sysctl_result != 0) {
+    is_set = true;
+    being_debugged = false;
+    return being_debugged;
+  }
+
+  // This process is being debugged if the P_TRACED flag is set.
+  is_set = true;
+  being_debugged = (info.KP_FLAGS & P_TRACED) != 0;
+  return being_debugged;
+}
+
+#elif defined(OS_LINUX)
+
+// We can look in /proc/self/status for TracerPid.  We are likely used in crash
+// handling, so we are careful not to use the heap or have side effects.
+// Another option that is common is to try to ptrace yourself, but then we
+// can't detach without forking(), and that's not so great.
+// static
+bool DebugUtil::BeingDebugged() {
+  int status_fd = open("/proc/self/status", O_RDONLY);
+  if (status_fd == -1)
+    return false;
+
+  // We assume our line will be in the first 1024 characters and that we can
+  // read this much all at once.  In practice this will generally be true.
+  // This simplifies and speeds up things considerably.
+  char buf[1024];
+
+  ssize_t num_read = HANDLE_EINTR(read(status_fd, buf, sizeof(buf)));
+  HANDLE_EINTR(close(status_fd));
+
+  if (num_read <= 0)
+    return false;
+
+  StringPiece status(buf, num_read);
+  StringPiece tracer("TracerPid:\t");
+
+  StringPiece::size_type pid_index = status.find(tracer);
+  if (pid_index == StringPiece::npos)
+    return false;
+
+  // Our pid is 0 without a debugger, assume this for any pid starting with 0.
+  pid_index += tracer.size();
+  return pid_index < status.size() && status[pid_index] != '0';
+}
+
+#endif  // OS_LINUX
+
+// static
+void DebugUtil::BreakDebugger() {
+#if defined(ARCH_CPU_X86_FAMILY)
+  asm ("int3");
+#endif
+}
+
+StackTrace::StackTrace() {
+  const int kMaxCallers = 256;
+
+  void* callers[kMaxCallers];
+#if MOZ_HAVE_EXECINFO_H
+  int count = backtrace(callers, kMaxCallers);
+#else
+  int count = 0;
+#endif
+
+  // Though the backtrace API man page does not list any possible negative
+  // return values, we still still exclude them because they would break the
+  // memcpy code below.
+  if (count > 0) {
+    trace_.resize(count);
+    memcpy(&trace_[0], callers, sizeof(callers[0]) * count);
+  } else {
+    trace_.resize(0);
+  }
+}
+
+void StackTrace::PrintBacktrace() {
+  fflush(stderr);
+#if MOZ_HAVE_EXECINFO_H
+  backtrace_symbols_fd(&trace_[0], trace_.size(), STDERR_FILENO);
+#endif
+}
+
+void StackTrace::OutputToStream(std::ostream* os) {
+  return;
+}