Intiialize AudioManager and related class lazily

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 8849f3790f93fe1c64d44f3d5b4dbb562e1363a7..7062f77868232c6dc99b72855f697f989dbaceaa 100644
--- a/media/audio/android/audio_manager_android.h
+++ b/media/audio/android/audio_manager_android.h
@@ -25,6 +25,8 @@ class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
       scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
       AudioLogFactory* audio_log_factory);
 
+  void InitializeIfNeeded();
+
   // Implementation of AudioManager.
   bool HasAudioOutputDevices() override;
   bool HasAudioInputDevices() override;
@@ -107,6 +109,8 @@ class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
   bool output_volume_override_set_;
   double output_volume_override_;
 
+  bool initialized_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerAndroid);
 };