cc: Rationalize sync points and lost status for returned resources

cc/layers/delegated_frame_resource_collection.h

Index: cc/layers/delegated_frame_resource_collection.h
diff --git a/cc/layers/delegated_frame_resource_collection.h b/cc/layers/delegated_frame_resource_collection.h
index 9a5d336749bb610580bcc552b95800d55c76c86d..7a22e29d86ef76bf140d7d8734409575054093fc 100644
--- a/cc/layers/delegated_frame_resource_collection.h
+++ b/cc/layers/delegated_frame_resource_collection.h
@@ -54,8 +54,12 @@ class CC_EXPORT DelegatedFrameResourceCollection
   bool lost_all_resources_;
 
   struct RefCount {
+    RefCount()
+        : refs_to_return(0), refs_to_wait_for(0), sync_point(0), lost(false) {}
     int refs_to_return;
     int refs_to_wait_for;
+    unsigned int sync_point;
+    bool lost;
   };
   typedef base::hash_map<unsigned, RefCount> ResourceIdRefCountMap;
   ResourceIdRefCountMap resource_id_ref_count_map_;