Add MODIFY_AUDIO_SETTINGS permission in Android manifest and implementation in audio manager.

media/audio/android/opensles_output.h

Index: media/audio/android/opensles_output.h
===================================================================
--- media/audio/android/opensles_output.h	(revision 186971)
+++ media/audio/android/opensles_output.h	(working copy)
@@ -5,13 +5,16 @@
 #ifndef MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
 #define MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
 
-#include <vector>
+#include <jni.h>
 
+#include "base/android/jni_android.h"
 #include "base/compiler_specific.h"
 #include "media/audio/android/opensles_util.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
+
 #include <SLES/OpenSLES_Android.h>
+#include <SLES/OpenSLES_AndroidConfiguration.h>
 
 namespace media {
 
@@ -52,6 +55,7 @@
   // If OpenSLES reports an error this function handles it and passes it to
   // the attached AudioOutputCallback::OnError().
   void HandleError(SLresult error);
+  void SetAudioMode();
 
   AudioManagerAndroid* audio_manager_;