Introduce AudioHardwareConfig for renderer side audio device info.

content/browser/renderer_host/media/audio_renderer_host.h

 // Copyright (c) 2012 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 67 matching lines @@
   virtual void OnDestruct() const OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
   // AudioOutputController::EventHandler implementations.
   virtual void OnCreated(media::AudioOutputController* controller) OVERRIDE;
   virtual void OnPlaying(media::AudioOutputController* controller) OVERRIDE;
   virtual void OnPaused(media::AudioOutputController* controller) OVERRIDE;
   virtual void OnError(media::AudioOutputController* controller,
                        int error_code) OVERRIDE;
+  virtual void OnDeviceChange(media::AudioOutputController* controller,
+                              int new_buffer_size,
+                              int new_sample_rate) OVERRIDE;
 
  private:
   friend class AudioRendererHostTest;
   friend class BrowserThread;
   friend class base::DeleteHelper<AudioRendererHost>;
   friend class MockAudioRendererHost;
   FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, CreateMockStream);
   FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, MockStreamDataConversation);
 
   struct AudioEntry;
@@ skipping 30 matching lines @@
   // Set the volume of the audio stream referenced by |stream_id|.
   void OnSetVolume(int stream_id, double volume);
 
   // Complete the process of creating an audio stream. This will set up the
   // shared memory or shared socket in low latency mode.
   void DoCompleteCreation(media::AudioOutputController* controller);
 
   // Send a state change message to the renderer.
   void DoSendPlayingMessage(media::AudioOutputController* controller);
   void DoSendPausedMessage(media::AudioOutputController* controller);
+  void DoSendDeviceChangeMessage(media::AudioOutputController* controller,
+                                 int new_buffer_size, int new_sample_rate);
 
   // Handle error coming from audio stream.
   void DoHandleError(media::AudioOutputController* controller, int error_code);
 
   // Send an error message to the renderer.
   void SendErrorMessage(int stream_id);
 
   // Delete all audio entry and all audio streams
   void DeleteEntries();
 
@@ skipping 28 matching lines @@
 
   // A map of stream IDs to audio sources.
   AudioEntryMap audio_entries_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_