CopyOutputResult must have a working release callback when received over mojo

cc/resources/texture_mailbox_releaser_provider.h

+// 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.
+
+#ifndef CC_RESOURCES_TEXTURE_MAILBOX_RELEASER_PROVIDER_H_
+#define CC_RESOURCES_TEXTURE_MAILBOX_RELEASER_PROVIDER_H_
+
+namespace mojo {
+template <class T>
+class InterfacePtr;
+}  // namespace mojo
+
+namespace cc {
+
+namespace mojom {
+class TextureMailboxReleaser;
+typedef mojo::InterfacePtr<TextureMailboxReleaser> TextureMailboxReleaserPtr;
+}  // namespace mojom
+
+class SingleReleaseCallback;
+
+// SingleReleaseCallback cannot be sent over mojo. An implementation of
+// TextureMailboxReleaserProvider takes in a SingleReleaseCallback and returns a
+// TextureMailboxReleaserPtr which can be sent over mojo and upon
+// calling Release() calls the given SingleReleaseCallback.
+class TextureMailboxReleaserProvider {
+ public:
+  virtual mojom::TextureMailboxReleaserPtr GetTextureMailboxReleaser(
+      std::unique_ptr<SingleReleaseCallback> release_callback) = 0;
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_TEXTURE_MAILBOX_RELEASER_PROVIDER_H_