Implement StructTraits for various cc and gpu types

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
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index 0000000000000000000000000000000000000000..02fa0e1d60f9cd7d85b1c52b52940b6b0213d720
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+++ b/cc/ipc/traits_test_service.mojom
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module cc.mojom;
+
+import "cc/ipc/render_pass_id.mojom";
+import "cc/ipc/returned_resource.mojom";
+import "cc/ipc/surface_id.mojom";
+
+interface TraitsTestService {
+  EchoRenderPassId(RenderPassId r) => (RenderPassId pass);
+  EchoReturnedResource(ReturnedResource r) => (ReturnedResource r);
+  EchoSurfaceId(SurfaceId s) => (SurfaceId pass);
+};