Implemented StructTraits for cc::CopyOutputResult

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 4e0bb99b6ec4c4c15b1e9e8be3288d80e3cbf8bc..1acde1b5ace15c61ddc9cf796ebc18bc31bcfcfa 100644
--- a/cc/ipc/traits_test_service.mojom
+++ b/cc/ipc/traits_test_service.mojom
@@ -8,6 +8,7 @@ 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/copy_output_result.mojom";
 import "cc/ipc/filter_operation.mojom";
 import "cc/ipc/filter_operations.mojom";
 import "cc/ipc/quads.mojom";
@@ -35,8 +36,10 @@ interface TraitsTestService {
       (CompositorFrameMetadata pass);
 
   [Sync]
-  EchoCopyOutputRequest(CopyOutputRequest c) =>
-      (CopyOutputRequest pass);
+  EchoCopyOutputRequest(CopyOutputRequest c) => (CopyOutputRequest pass);
+
+  [Sync]
+  EchoCopyOutputResult(CopyOutputResult c) => (CopyOutputResult pass);
 
   [Sync]
   EchoFilterOperation(FilterOperation f) => (FilterOperation pass);