cc: Propagate read lock fences constraints to parent compositors.

cc/resources/transferable_resource.h

Index: cc/resources/transferable_resource.h
diff --git a/cc/resources/transferable_resource.h b/cc/resources/transferable_resource.h
index 7bb0b8f4b108ed0744cc2ed4f7b0bd224c0b599c..6f38a62f7fc84b05635f8644237629b0d166b0a4 100644
--- a/cc/resources/transferable_resource.h
+++ b/cc/resources/transferable_resource.h
@@ -34,6 +34,7 @@ struct CC_EXPORT TransferableResource {
   uint32 filter;
   gfx::Size size;
   gpu::MailboxHolder mailbox_holder;
+  bool read_lock_fences_enabled;
   bool is_repeated;
   bool is_software;
   bool allow_overlay;