CopyOutputResult must have a working release callback when received over mojo

cc/ipc/traits_test_service.mojom

Index: cc/ipc/traits_test_service.mojom
diff --git a/cc/ipc/traits_test_service.mojom b/cc/ipc/traits_test_service.mojom
index 1acde1b5ace15c61ddc9cf796ebc18bc31bcfcfa..62d23aebffa46d457948a1accb96b1df4fbd07ad 100644
--- a/cc/ipc/traits_test_service.mojom
+++ b/cc/ipc/traits_test_service.mojom
@@ -16,6 +16,7 @@ import "cc/ipc/render_pass.mojom";
 import "cc/ipc/returned_resource.mojom";
 import "cc/ipc/selection.mojom";
 import "cc/ipc/shared_quad_state.mojom";
+import "cc/ipc/single_release_callback.mojom";
 import "cc/ipc/surface_id.mojom";
 import "cc/ipc/surface_reference.mojom";
 import "cc/ipc/surface_sequence.mojom";
@@ -57,6 +58,10 @@ interface TraitsTestService {
   EchoSelection(Selection s) => (Selection pass);
 
   [Sync]
+  EchoSingleReleaseCallback(SingleReleaseCallback s)
+    => (SingleReleaseCallback pass);
+
+  [Sync]
   EchoSharedQuadState(SharedQuadState s) => (SharedQuadState pass);
 
   [Sync]