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 7f265b79a6c400ac100313b85b8784eb9b3b2158..f03da6f71f35387297e8b8b3874c83fce5455595 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -165,6 +165,9 @@ 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);