Reland "Refactor audio manager for Android to avoid heavy tasks at startup"

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 2900c0f8e290efe86251a195868ec215c7e4221f..670c094900d26dd230bb82f9da0eb9713f0de855 100644
--- a/media/audio/android/audio_manager_android.h
+++ b/media/audio/android/audio_manager_android.h
@@ -67,10 +67,11 @@ class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
       const AudioParameters& input_params) OVERRIDE;
 
  private:
+  bool HadNoAudioStreams();
   void Init();
   void Close();
-  void SetAudioMode(int mode);
-  void SetAudioDevice(const std::string& device_id);
+  void SetCommunicationAudioModeOn(bool on);
+  bool SetAudioDevice(const std::string& device_id);
   int GetNativeOutputSampleRate();
   bool IsAudioLowLatencySupported();
   int GetAudioLowLatencyOutputFrameSize();