CopyOutputResult must have a working release callback when received over mojo

cc/ipc/single_release_callback_struct_traits.h

+// 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.
+
+#ifndef CC_IPC_SINGLE_RELEASE_CALLBACK_STRUCT_TRAITS_H_
+#define CC_IPC_SINGLE_RELEASE_CALLBACK_STRUCT_TRAITS_H_
+
+#include "cc/ipc/single_release_callback.mojom-shared.h"
+#include "cc/resources/single_release_callback.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<cc::mojom::SingleReleaseCallbackDataView,
+                    std::unique_ptr<cc::SingleReleaseCallback>> {
+  static cc::mojom::TextureMailboxReleaserPtr releaser(
+      const std::unique_ptr<cc::SingleReleaseCallback>& callback);
+
+  static bool Read(cc::mojom::SingleReleaseCallbackDataView data,
+                   std::unique_ptr<cc::SingleReleaseCallback>* out);
+};
+
+}  // namespace mojo
+
+#endif  // CC_IPC_SINGLE_RELEASE_CALLBACK_STRUCT_TRAITS_H_