Implement MediaMetadata artwork in content

content/renderer/media/android/renderer_media_session_manager.cc

 // Copyright 2015 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 "content/renderer/media/android/renderer_media_session_manager.h"
 
 #include "base/logging.h"
 #include "content/common/media/media_session_messages_android.h"
 #include "content/public/common/media_metadata.h"
 #include "content/public/renderer/render_thread.h"
@@ skipping 56 matching lines @@
     const MediaMetadata& metadata) {
   // Apply some sanity checks on the MediaMetadata before sending over IPC.
   MediaMetadata ipc_metadata;
   ipc_metadata.title =
       metadata.title.substr(0, MediaMetadata::kMaxIPCStringLength);
   ipc_metadata.artist =
       metadata.artist.substr(0, MediaMetadata::kMaxIPCStringLength);
   ipc_metadata.album =
       metadata.album.substr(0, MediaMetadata::kMaxIPCStringLength);
 
+  for (const MediaMetadata::Artwork& artwork : metadata.artwork) {

[palmer, 2016/06/20 21:34:21]

Nit: Can use auto here too, to clarify the code.

[Zhiqiang Zhang (Slow), 2016/06/21 11:08:42]

Done.

+    base::Optional<MediaMetadata::Artwork> sanitized_artwork =
+        MediaMetadata::SanitizeArtwork(artwork);
+    if (sanitized_artwork)
+      ipc_metadata.artwork.push_back(sanitized_artwork.value());
+  }
+
   Send(new MediaSessionHostMsg_SetMetadata(routing_id(),
                                            session_id,
                                            ipc_metadata));
 }
 
 void RendererMediaSessionManager::OnDidActivate(int request_id, bool success) {
   DCHECK(pending_activation_requests_.Lookup(request_id)) << request_id;
   blink::WebMediaSessionActivateCallback* callback =
       pending_activation_requests_.Lookup(request_id);
   if (success) {
     callback->onSuccess();
   } else {
     callback->onError(
         blink::WebMediaSessionError(blink::WebMediaSessionError::Activate));
   }
   pending_activation_requests_.Remove(request_id);
 }
 
 void RendererMediaSessionManager::OnDidDeactivate(int request_id) {
   DCHECK(pending_deactivation_requests_.Lookup(request_id)) << request_id;
   pending_deactivation_requests_.Lookup(request_id)->onSuccess();
   pending_deactivation_requests_.Remove(request_id);
 }
 
 }  // namespace content