Add speaker on/off control on Android for WebRTC

media/audio/audio_manager_base.h

Index: media/audio/audio_manager_base.h
===================================================================
--- media/audio/audio_manager_base.h	(revision 189667)
+++ media/audio/audio_manager_base.h	(working copy)
@@ -140,7 +140,11 @@
   // Called by Shutdown().
   void ShutdownOnAudioThread();
 
+#if defined(OS_ANDROID)
   void SetAudioMode(int mode);
+  void RegisterHeadsetReceiver();
+  void UnregisterHeadsetReceiver();
+#endif
 
   // Counts the number of active input streams to find out if something else
   // is currently recording in Chrome.
@@ -171,6 +175,11 @@
   // and GetMessageLoop() starts returning NULL.
   scoped_refptr<base::MessageLoopProxy> message_loop_;
 
+#if defined(OS_ANDROID)
+  // Java AudioManager instance.
+  base::android::ScopedJavaGlobalRef<jobject> j_audio_manager_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerBase);
 };