Added methods to generate sync tokens for resource id(s).

cc/layers/video_layer_impl.cc

Index: cc/layers/video_layer_impl.cc
diff --git a/cc/layers/video_layer_impl.cc b/cc/layers/video_layer_impl.cc
index 1eb4ef0de2a02dc145681bfa29f00a5ccd6058dc..d4415da4b35fb0e22905be808eb5f0b6abd8e412 100644
--- a/cc/layers/video_layer_impl.cc
+++ b/cc/layers/video_layer_impl.cc
@@ -124,6 +124,7 @@ bool VideoLayerImpl::WillDraw(DrawMode draw_mode,
 
   DCHECK_EQ(external_resources.mailboxes.size(),
             external_resources.release_callbacks.size());
+  ResourceProvider::ResourceIdArray resource_ids;

[piman, 2016/02/17 22:47:04]

nit: resource_ids.reserve(external_resources.mailboxes.size()); to avoid
reallocs.

[David Yen, 2016/02/17 22:52:53]

Done.

   for (size_t i = 0; i < external_resources.mailboxes.size(); ++i) {
     unsigned resource_id = resource_provider->CreateResourceFromTextureMailbox(
         external_resources.mailboxes[i],
@@ -133,7 +134,9 @@ bool VideoLayerImpl::WillDraw(DrawMode draw_mode,
     frame_resources_.push_back(FrameResource(
         resource_id, external_resources.mailboxes[i].size_in_pixels(),
         external_resources.mailboxes[i].is_overlay_candidate()));
+    resource_ids.push_back(resource_id);
   }
+  resource_provider->GenerateSyncTokenForResources(resource_ids);
 
   return true;
 }