Make BrowserMessageFilter support dispatching messages on different threads.

chrome/browser/renderer_host/audio_renderer_host.h

 // Copyright (c) 2010 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.
 //
 // AudioRendererHost serves audio related requests from AudioRenderer which
 // lives inside the render process and provide access to audio hardware.
 //
 // This class is owned by BrowserRenderProcessHost, and instantiated on UI
 // thread, but all other operations and method calls happen on IO thread, so we
 // need to be extra careful about the lifetime of this object. AudioManager is a
@@ skipping 42 matching lines @@
 #define CHROME_BROWSER_RENDERER_HOST_AUDIO_RENDERER_HOST_H_
 #pragma once
 
 #include <map>
 
 #include "base/gtest_prod_util.h"
 #include "base/process.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/shared_memory.h"
-#include "chrome/browser/browser_io_message_filter.h"
+#include "chrome/browser/browser_message_filter.h"
 #include "chrome/browser/browser_thread.h"
 #include "ipc/ipc_message.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_output_controller.h"
 #include "media/audio/simple_sources.h"
 
 class AudioManager;
 struct ViewHostMsg_Audio_CreateStream_Params;
 
-class AudioRendererHost : public BrowserIOMessageFilter,
+class AudioRendererHost : public BrowserMessageFilter,
                           public media::AudioOutputController::EventHandler {
  public:
   typedef std::pair<int32, int> AudioEntryId;
 
   struct AudioEntry {
     AudioEntry();
     ~AudioEntry();
 
     // The AudioOutputController that manages the audio stream.
     scoped_refptr<media::AudioOutputController> controller;
@@ skipping 16 matching lines @@
     // Set to true after we called Close() for the controller.
     bool pending_close;
   };
 
   typedef std::map<AudioEntryId, AudioEntry*> AudioEntryMap;
 
   // Called from UI thread from the owner of this object.
   AudioRendererHost();
 
 
-  // BrowserIOMessageFilter implementation
-  virtual bool OnMessageReceived(const IPC::Message& message);
+  // BrowserMessageFilter implementation.
   virtual void OnChannelClosing();
   virtual void OnDestruct() const;
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok);
 
   /////////////////////////////////////////////////////////////////////////////
   // AudioOutputController::EventHandler implementations.
   virtual void OnCreated(media::AudioOutputController* controller);
   virtual void OnPlaying(media::AudioOutputController* controller);
   virtual void OnPaused(media::AudioOutputController* controller);
   virtual void OnError(media::AudioOutputController* controller,
                        int error_code);
   virtual void OnMoreData(media::AudioOutputController* controller,
                           AudioBuffersState buffers_state);
@@ skipping 89 matching lines @@
   // event is received.
   AudioEntry* LookupByController(media::AudioOutputController* controller);
 
   // A map of id to audio sources.
   AudioEntryMap audio_entries_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_AUDIO_RENDERER_HOST_H_