CopyOutputResult must have a working release callback when received over mojo

cc/ipc/single_release_callback_struct_traits.cc

+// 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.
+
+#include "cc/ipc/single_release_callback_struct_traits.h"
+#include "cc/ipc/texture_mailbox_releaser.mojom.h"
+
+namespace mojo {
+
+// static
+cc::mojom::TextureMailboxReleaserPtr
+StructTraits<cc::mojom::SingleReleaseCallbackDataView,
+             std::unique_ptr<cc::SingleReleaseCallback>>::
+    releaser(const std::unique_ptr<cc::SingleReleaseCallback>& callback) {
+  auto result = callback->ptr_holder_->TakePtr();
+  callback->ptr_holder_.reset();
+  return result;
+}
+
+// static
+bool StructTraits<cc::mojom::SingleReleaseCallbackDataView,
+                  std::unique_ptr<cc::SingleReleaseCallback>>::
+    Read(cc::mojom::SingleReleaseCallbackDataView data,
+         std::unique_ptr<cc::SingleReleaseCallback>* out) {
+  auto releaser = data.TakeReleaser<cc::mojom::TextureMailboxReleaserPtr>();
+  *out = cc::SingleReleaseCallback::Create(std::move(releaser));
+  return true;
+}
+
+}  // namespace mojo