Add support for audio input mute detection on all platforms

media/audio/fake_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.
 //
 // A fake implementation of AudioInputStream, useful for testing purpose.
 
 #ifndef MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
 #define MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
 
 #include <vector>
@@ skipping 16 matching lines @@
   static AudioInputStream* MakeFakeStream(AudioManagerBase* manager,
                                           const AudioParameters& params);
 
   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 bool IsMuted() override;
   virtual void SetAutomaticGainControl(bool enabled) override;
   virtual bool GetAutomaticGainControl() override;
 
   // Generate one beep sound. This method is called by
   // FakeVideoCaptureDevice to test audio/video synchronization.
   // This is a static method because FakeVideoCaptureDevice is
   // disconnected from an audio device. This means only one instance of
   // this class gets to respond, which is okay because we assume there's
   // only one stream for this testing purpose.
   // TODO(hclam): Make this non-static. To do this we'll need to fix
@@ skipping 27 matching lines @@
   // Allows us to run tasks on the FakeAudioInputStream instance which are
   // bound by its lifetime.
   base::WeakPtrFactory<FakeAudioInputStream> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_