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

media/base/android/media_player_bridge.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/android/media_player_bridge.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 306 matching lines @@
   SetVideoSurface(gfx::ScopedJavaSurface());
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_MediaPlayerBridge_release(env, j_media_player_bridge_.obj());
   j_media_player_bridge_.Reset();
   release_media_resources_cb_.Run(player_id());
   listener_->ReleaseMediaPlayerListenerResources();
 }
 
 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);
   Java_MediaPlayerBridge_setVolume(
       env, j_media_player_bridge_.obj(), volume);
 }
 
 void MediaPlayerBridge::OnVideoSizeChanged(int width, int height) {
   width_ = width;
   height_ = height;
@@ skipping 135 matching lines @@
 
 GURL MediaPlayerBridge::GetFirstPartyForCookies() {
   return first_party_for_cookies_;
 }
 
 bool MediaPlayerBridge::IsSurfaceInUse() const {
   return is_surface_in_use_;
 }
 
 }  // namespace media