Add support for audio input mute detection on all platforms

media/audio/virtual_audio_input_stream.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_VIRTUAL_AUDIO_INPUT_STREAM_H_
 #define MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_
 
 #include <map>
 #include <set>
 
@@ skipping 38 matching lines @@
   // AudioInputStream:
   virtual bool Open() override;
   virtual void Start(AudioInputCallback* callback) override;
   virtual void Stop() override;
   virtual void Close() override;
   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;
 
   // Attaches a VirtualAudioOutputStream to be used as input. This
   // VirtualAudioInputStream must outlive all attached streams, so any attached
   // stream must be closed (which causes a detach) before
   // VirtualAudioInputStream is destroyed.
   virtual void AddOutputStream(VirtualAudioOutputStream* stream,
                                const AudioParameters& output_params);
 
   // Detaches a VirtualAudioOutputStream and removes it as input.
   virtual void RemoveOutputStream(VirtualAudioOutputStream* stream,
@@ skipping 38 matching lines @@
   FakeAudioConsumer fake_consumer_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(VirtualAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_