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 a9834caca3f919b1029f06495d2d65644912fbec..dfbf14b609dc91b31962f02db3fc3231b9dae359 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -161,6 +161,12 @@ class CC_EXPORT ResourceProvider
   void GenerateSyncTokenForResource(ResourceId resource_id);
   void GenerateSyncTokenForResources(const ResourceIdArray& resource_ids);
 
+  // Gets the sync token for the indicated resource.
+  gpu::SyncToken GetSyncTokenForResource(ResourceId resource_id);
+
+  // 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);