diff -r 000000000000 -r 6474c204b198 dom/ipc/TabMessageUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/ipc/TabMessageUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,101 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 TABMESSAGE_UTILS_H
+#define TABMESSAGE_UTILS_H
+
+#include "AudioChannelCommon.h"
+#include "ipc/IPCMessageUtils.h"
+#include "mozilla/dom/AudioChannelBinding.h"
+#include "nsIDOMEvent.h"
+#include "nsCOMPtr.h"
+
+#ifdef MOZ_CRASHREPORTER
+#include "nsExceptionHandler.h"
+#endif
+
+namespace mozilla {
+namespace dom {
+struct RemoteDOMEvent
+{
+  // Make sure to set the owner after deserializing.
+  nsCOMPtr<nsIDOMEvent> mEvent;
+};
+
+bool ReadRemoteEvent(const IPC::Message* aMsg, void** aIter,
+                     mozilla::dom::RemoteDOMEvent* aResult);
+
+#ifdef MOZ_CRASHREPORTER
+typedef CrashReporter::ThreadId NativeThreadId;
+#else
+// unused in this case
+typedef int32_t NativeThreadId;
+#endif
+
+}
+}
+
+namespace IPC {
+
+template<>
+struct ParamTraits<mozilla::dom::RemoteDOMEvent>
+{
+  typedef mozilla::dom::RemoteDOMEvent paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam)
+  {
+    aParam.mEvent->Serialize(aMsg, true);
+  }
+
+  static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
+  {
+    return mozilla::dom::ReadRemoteEvent(aMsg, aIter, aResult);
+  }
+
+  static void Log(const paramType& aParam, std::wstring* aLog)
+  {
+  }
+};
+
+template<>
+struct ParamTraits<mozilla::dom::AudioChannel>
+{
+  typedef mozilla::dom::AudioChannel paramType;
+
+  static bool IsLegalValue(const paramType &aValue) {
+    return aValue <= mozilla::dom::AudioChannel::Publicnotification;
+  }
+
+  static void Write(Message* aMsg, const paramType& aValue) {
+    MOZ_ASSERT(IsLegalValue(aValue));
+    WriteParam(aMsg, (uint32_t)aValue);
+  }
+
+  static bool Read(const Message* aMsg, void** aIter, paramType* aResult) {
+    uint32_t value;
+    if(!ReadParam(aMsg, aIter, &value) ||
+       !IsLegalValue(paramType(value))) {
+      return false;
+    }
+    *aResult = paramType(value);
+    return true;
+  }
+
+  static void Log(const paramType& aParam, std::wstring* aLog)
+  {
+  }
+};
+
+template <>
+struct ParamTraits<mozilla::dom::AudioChannelState>
+  : public ContiguousEnumSerializer<mozilla::dom::AudioChannelState,
+                                    mozilla::dom::AUDIO_CHANNEL_STATE_NORMAL,
+                                    mozilla::dom::AUDIO_CHANNEL_STATE_LAST>
+{ };
+
+}
+
+
+#endif