Implemented StructTraits for cc::CopyOutputRequest

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 b77c187cda8fe07bd847c5e03c48bbce8a90c927..4e0bb99b6ec4c4c15b1e9e8be3288d80e3cbf8bc 100644
--- a/cc/ipc/traits_test_service.mojom
+++ b/cc/ipc/traits_test_service.mojom
@@ -7,6 +7,7 @@ module cc.mojom;
 import "cc/ipc/begin_frame_args.mojom";
 import "cc/ipc/compositor_frame.mojom";
 import "cc/ipc/compositor_frame_metadata.mojom";
+import "cc/ipc/copy_output_request.mojom";
 import "cc/ipc/filter_operation.mojom";
 import "cc/ipc/filter_operations.mojom";
 import "cc/ipc/quads.mojom";
@@ -34,6 +35,10 @@ interface TraitsTestService {
       (CompositorFrameMetadata pass);
 
   [Sync]
+  EchoCopyOutputRequest(CopyOutputRequest c) =>
+      (CopyOutputRequest pass);
+
+  [Sync]
   EchoFilterOperation(FilterOperation f) => (FilterOperation pass);
 
   [Sync]