diff -r 000000000000 -r 6474c204b198 docshell/base/SerializedLoadContext.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docshell/base/SerializedLoadContext.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef SerializedLoadContext_h
+#define SerializedLoadContext_h
+
+#include "base/basictypes.h"
+#include "ipc/IPCMessageUtils.h"
+
+class nsILoadContext;
+
+/*
+ *  This file contains the IPC::SerializedLoadContext class, which is used to
+ *  copy data across IPDL from Child process contexts so it is available in the
+ *  Parent.
+ */
+
+class nsIChannel;
+class nsIWebSocketChannel;
+
+namespace IPC {
+
+class SerializedLoadContext
+{
+public:
+  SerializedLoadContext()
+  {
+    Init(nullptr);
+  }
+
+  SerializedLoadContext(nsILoadContext* aLoadContext);
+  SerializedLoadContext(nsIChannel* aChannel);
+  SerializedLoadContext(nsIWebSocketChannel* aChannel);
+
+  void Init(nsILoadContext* aLoadContext);
+
+  bool IsNotNull() const
+  {
+    return mIsNotNull;
+  }
+
+  bool IsPrivateBitValid() const
+  {
+    return mIsPrivateBitValid;
+  }
+
+  // used to indicate if child-side LoadContext * was null.
+  bool          mIsNotNull;
+  // used to indicate if child-side mUsePrivateBrowsing flag is valid, even if
+  // mIsNotNull is false, i.e., child LoadContext was null.
+  bool          mIsPrivateBitValid;
+  bool          mIsContent;
+  bool          mUsePrivateBrowsing;
+  bool          mUseRemoteTabs;
+  bool          mIsInBrowserElement;
+  uint32_t      mAppId;
+};
+
+// Function to serialize over IPDL
+template<>
+struct ParamTraits<SerializedLoadContext>
+{
+  typedef SerializedLoadContext paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam)
+  {
+    WriteParam(aMsg, aParam.mIsNotNull);
+    WriteParam(aMsg, aParam.mIsContent);
+    WriteParam(aMsg, aParam.mIsPrivateBitValid);
+    WriteParam(aMsg, aParam.mUsePrivateBrowsing);
+    WriteParam(aMsg, aParam.mUseRemoteTabs);
+    WriteParam(aMsg, aParam.mAppId);
+    WriteParam(aMsg, aParam.mIsInBrowserElement);
+  }
+
+  static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
+  {
+    if (!ReadParam(aMsg, aIter, &aResult->mIsNotNull) ||
+        !ReadParam(aMsg, aIter, &aResult->mIsContent)  ||
+        !ReadParam(aMsg, aIter, &aResult->mIsPrivateBitValid)  ||
+        !ReadParam(aMsg, aIter, &aResult->mUsePrivateBrowsing)  ||
+        !ReadParam(aMsg, aIter, &aResult->mUseRemoteTabs)  ||
+        !ReadParam(aMsg, aIter, &aResult->mAppId)  ||
+        !ReadParam(aMsg, aIter, &aResult->mIsInBrowserElement)) {
+      return false;
+    }
+
+    return true;
+  }
+};
+
+} // namespace IPC
+
+#endif // SerializedLoadContext_h
+