[Android] Fix the issue of muted attribute in video element does not work.

media/base/android/media_player_bridge.cc

Index: media/base/android/media_player_bridge.cc
diff --git a/media/base/android/media_player_bridge.cc b/media/base/android/media_player_bridge.cc
index b1bb3fec3cfa5ecf8d3b64a105717a5d9083747f..09ed254d2b55bab7b9d24fdb99f3d2cb548972a4 100644
--- a/media/base/android/media_player_bridge.cc
+++ b/media/base/android/media_player_bridge.cc
@@ -324,7 +324,7 @@ void MediaPlayerBridge::Release() {
 
 void MediaPlayerBridge::SetVolume(double volume) {
   if (j_media_player_bridge_.is_null())
-    return;
+    Prepare();

[qinmin, 2014/05/27 15:09:53]

The player could get destroyed if releaseMediaResources is called. The correct
implementation should use a member variable to store the volume here, and call
the jni function when java mediaplayer is created.
Check the implementation in media_source_player.cc

 
   JNIEnv* env = base::android::AttachCurrentThread();
   CHECK(env);