Detect AudioInputStream muting and propagate to MediaStreamAudioSource.

media/audio/audio_input_device.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.
 
 // Low-latency audio capturing class utilizing audio input stream provided
 // by a server (browser) process by use of an IPC interface.
 //
 // Relationship of classes:
 //
 //  AudioInputController                 AudioInputDevice
@@ skipping 88 matching lines @@
   friend class base::RefCountedThreadSafe<AudioInputDevice>;
   ~AudioInputDevice() override;
 
   // Methods called on IO thread ----------------------------------------------
   // AudioInputIPCDelegate implementation.
   void OnStreamCreated(base::SharedMemoryHandle handle,
                        base::SyncSocket::Handle socket_handle,
                        int length,
                        int total_segments) override;
   void OnError() override;
+  void OnMuted(bool is_muted) override;
   void OnIPCClosed() override;
 
  private:
   // Note: The ordering of members in this enum is critical to correct behavior!
   enum State {
     IPC_CLOSED,  // No more IPCs can take place.
     IDLE,  // Not started.
     CREATING_STREAM,  // Waiting for OnStreamCreated() to be called back.
     RECORDING,  // Receiving audio data.
   };
@@ skipping 77 matching lines @@
   // Flags that missing callbacks has been detected. Used for statistics,
   // reported when stopping. Must only be accessed on the IO thread.
   bool missing_callbacks_detected_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputDevice);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_INPUT_DEVICE_H_