Delay activation/draw on GPU tile work completion

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 38d086ded899777379b128abdf11d89ead00f17a..52374a6a4c479d717c5fd2f85423fcd5578acac0 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -162,6 +162,9 @@ class CC_EXPORT ResourceProvider
   void GenerateSyncTokenForResource(ResourceId resource_id);
   void GenerateSyncTokenForResources(const ResourceIdArray& resource_ids);
 
+  // Gets the most recent sync token from the indicated resources.
+  gpu::SyncToken GetSyncTokenForResources(const ResourceIdArray& resource_ids);
+
   // Creates accounting for a child. Returns a child ID.
   int CreateChild(const ReturnCallback& return_callback);