Add support for audio input mute detection on all platforms

media/audio/win/wavein_input_win.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.
 
 #ifndef MEDIA_AUDIO_WIN_WAVEIN_INPUT_WIN_H_
 #define MEDIA_AUDIO_WIN_WAVEIN_INPUT_WIN_H_
 
 #include <string>
 
 #include <windows.h>
@@ skipping 27 matching lines @@
   virtual bool Open() override;
   virtual void Start(AudioInputCallback* callback) override;
   virtual void Stop() override;
   virtual void Close() override;
   // TODO(henrika): Add volume support using the Audio Mixer API.
   virtual double GetMaxVolume() override;
   virtual void SetVolume(double volume) override;
   virtual double GetVolume() override;
   virtual void SetAutomaticGainControl(bool enabled) override;
   virtual bool GetAutomaticGainControl() override;
+  virtual bool IsMuted() override;
 
  private:
   enum State {
     kStateEmpty,      // Initial state.
     kStateReady,      // Device obtained and ready to record.
     kStateRecording,  // Recording audio.
     kStateStopping,   // Trying to stop, waiting for callback to finish.
     kStateStopped,    // Stopped. Device was reset.
     kStateClosed      // Device has been released.
   };
@@ skipping 69 matching lines @@
   // Extra audio bus used for storage of deinterleaved data for the OnData
   // callback.
   scoped_ptr<media::AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMWaveInAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_WIN_WAVEIN_INPUT_WIN_H_