Add support for audio input mute detection on all platforms

media/audio/android/opensles_input.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_ANDROID_OPENSLES_INPUT_H_
 #define MEDIA_AUDIO_ANDROID_OPENSLES_INPUT_H_
 
 #include <SLES/OpenSLES.h>
 #include <SLES/OpenSLES_Android.h>
 
@@ skipping 25 matching lines @@
   // Implementation of 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;
 
  private:
   bool CreateRecorder();
 
   // Called from OpenSLES specific audio worker thread.
   static void SimpleBufferQueueCallback(
       SLAndroidSimpleBufferQueueItf buffer_queue,
       void* instance);
 
   // Called from OpenSLES specific audio worker thread.
@@ skipping 40 matching lines @@
   bool started_;
 
   scoped_ptr<media::AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(OpenSLESInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_ANDROID_OPENSLES_INPUT_H_