Detect AudioInputStream muting and propagate to MediaStreamAudioSource.

content/browser/renderer_host/media/audio_input_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.
 //
 // AudioInputRendererHost serves audio related requests from audio capturer
 // which lives inside the render process and provide access to audio hardware.
 //
 // Create stream sequence (AudioInputController = AIC):
 //
 // AudioInputHostMsg_CreateStream -> OnCreateStream -> AIC::CreateLowLatency ->
@@ skipping 91 matching lines @@
   void OnChannelClosing() override;
   void OnDestruct() const override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // AudioInputController::EventHandler implementation.
   void OnCreated(media::AudioInputController* controller) override;
   void OnError(media::AudioInputController* controller,
                media::AudioInputController::ErrorCode error_code) override;
   void OnLog(media::AudioInputController* controller,
              const std::string& message) override;
+  void OnMuted(media::AudioInputController* controller, bool is_muted) override;
 
   // Sets the PID renderer. This is used for constructing the debug recording
   // filename.
   void set_renderer_pid(int32_t renderer_pid);
 
  protected:
   ~AudioInputRendererHost() override;
 
  private:
   friend class BrowserThread;
@@ skipping 42 matching lines @@
   void DoSendRecordingMessage(media::AudioInputController* controller);
 
   // Handle error coming from audio stream.
   void DoHandleError(media::AudioInputController* controller,
       media::AudioInputController::ErrorCode error_code);
 
   // Log audio level of captured audio stream.
   void DoLog(media::AudioInputController* controller,
              const std::string& message);
 
+  // Notify renderer of a change to a stream's muted state.
+  void DoNotifyMutedState(media::AudioInputController* controller,
+                          bool is_muted);
+
   // Send an error message to the renderer.
   void SendErrorMessage(int stream_id, ErrorCode error_code);
 
   // Delete all audio entries and all audio streams.
   void DeleteEntries();
 
   // Closes the stream. The stream is then deleted in DeleteEntry() after it
   // is closed.
   void CloseAndDeleteStream(AudioEntry* entry);
 
@@ skipping 61 matching lines @@
   media::UserInputMonitor* const user_input_monitor_;
 
   std::unique_ptr<media::AudioLog> audio_log_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioInputRendererHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_RENDERER_HOST_H_