Implement MediaMetadata artwork in content

content/browser/media/android/media_web_contents_observer_android.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_
 #define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 24 matching lines @@
   // Gets one of the managers associated with the given |render_frame_host|.
   // Creates a new one if it doesn't exist. The caller doesn't own the
   // returned pointer.
   BrowserMediaPlayerManager* GetMediaPlayerManager(
       RenderFrameHost* render_frame_host);
   BrowserMediaSessionManager* GetMediaSessionManager(
       RenderFrameHost* render_frame_host);
   BrowserSurfaceViewManager* GetSurfaceViewManager(
       RenderFrameHost* render_frame_host);
 
+  // Sets or overrides the BrowserMediaSessionManager for the given
+  // |render_frame_host|.
+  void SetMediaSessionManagerForTest(
+      RenderFrameHost* render_frame_host,
+      std::unique_ptr<BrowserMediaSessionManager>& manager);
+
   // Called by the WebContents when a tab has been closed but may still be
   // available for "undo" -- indicates that all media players (even audio only
   // players typically allowed background audio) bound to this WebContents must
   // be suspended.
   void SuspendAllMediaPlayers();
 
   // Initiates a synchronous MediaSession request for browser side players.
   //
   // TODO(dalecurtis): Delete this method once we're no longer using WMPA and
   // the BrowserMediaPlayerManagers.  Tracked by http://crbug.com/580626
@@ skipping 48 matching lines @@
       base::ScopedPtrHashMap<RenderFrameHost*,
                              std::unique_ptr<BrowserSurfaceViewManager>>;
   SurfaceViewManagerMap surface_view_managers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserverAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_