Implement MediaMetadata artwork in content

content/browser/media/android/media_web_contents_observer_android.cc

Index: content/browser/media/android/media_web_contents_observer_android.cc
diff --git a/content/browser/media/android/media_web_contents_observer_android.cc b/content/browser/media/android/media_web_contents_observer_android.cc
index 5a6c451f13a4a9c0a14900372580293ec1b2c368..d52b2168defcbea8f781ab97d6bc90f44fe965f8 100644
--- a/content/browser/media/android/media_web_contents_observer_android.cc
+++ b/content/browser/media/android/media_web_contents_observer_android.cc
@@ -4,6 +4,8 @@
 
 #include "content/browser/media/android/media_web_contents_observer_android.h"
 
+#include <utility>
+
 #include "base/memory/ptr_util.h"
 #include "content/browser/media/android/browser_media_player_manager.h"
 #include "content/browser/media/android/browser_media_session_manager.h"
@@ -80,6 +82,14 @@ MediaWebContentsObserverAndroid::GetSurfaceViewManager(
   return manager;
 }
 
+void MediaWebContentsObserverAndroid::SetMediaSessionManagerForTest(
+    RenderFrameHost* render_frame_host,
+    std::unique_ptr<BrowserMediaSessionManager>& manager) {
+  media_session_managers_.set(
+      render_frame_host,
+      std::forward<std::unique_ptr<BrowserMediaSessionManager>>(manager));

[dcheng, 2016/07/06 02:34:15]

This should just be std::move(manager) (once the arg is passed by value)

[Zhiqiang Zhang (Slow), 2016/07/06 15:38:38]

Done.

+}
+
 void MediaWebContentsObserverAndroid::SuspendAllMediaPlayers() {
   web_contents()->ForEachFrame(
       base::Bind(&SuspendAllMediaPlayersInRenderFrame));