Add MuteableAudioOutputStream interface to export SetMute().

media/audio/android/audio_manager_android.h

Index: media/audio/android/audio_manager_android.h
diff --git a/media/audio/android/audio_manager_android.h b/media/audio/android/audio_manager_android.h
index 20707bc5d274bc08d50b4a6c6fd455db4c9dbb2c..c65b6340b5dfdcfc06c7206af2174da9871c72c3 100644
--- a/media/audio/android/audio_manager_android.h
+++ b/media/audio/android/audio_manager_android.h
@@ -15,7 +15,7 @@
 
 namespace media {
 
-class OpenSLESOutputStream;
+class MuteableAudioOutputStream;
 
 // Android implemention of AudioManager.
 class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
@@ -54,6 +54,10 @@ class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
       const AudioParameters& params,
       const std::string& device_id,
       const LogCallback& log_callback) override;
+  AudioOutputStream* MakeBitstreamOutputStream(
+      const AudioParameters& params,
+      const std::string& device_id,
+      const LogCallback& log_callback) override;
   AudioInputStream* MakeLinearInputStream(
       const AudioParameters& params,
       const std::string& device_id,
@@ -96,7 +100,7 @@ class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
   // Java AudioManager instance.
   base::android::ScopedJavaGlobalRef<jobject> j_audio_manager_;
 
-  typedef std::set<OpenSLESOutputStream*> OutputStreams;
+  typedef std::set<MuteableAudioOutputStream*> OutputStreams;
   OutputStreams streams_;
 
   // Enabled when first input stream is created and set to false when last