Implemented StructTraits for cc::CopyOutputResult

cc/ipc/copy_output_result.mojom

Index: cc/ipc/copy_output_result.mojom
diff --git a/cc/ipc/copy_output_result.mojom b/cc/ipc/copy_output_result.mojom
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index 0000000000000000000000000000000000000000..a925e10d6b4986a1512ecd4820c1c98fc6fce7cb
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+++ b/cc/ipc/copy_output_result.mojom
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+// Copyright 2017 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/texture_mailbox.mojom";
+import "skia/public/interfaces/bitmap.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+
+// See cc/output/copy_output_result.h.
+struct CopyOutputResult {
+  gfx.mojom.Size size;
+  skia.mojom.Bitmap? bitmap;
+  cc.mojom.TextureMailbox texture_mailbox;
+};