CopyOutputResult must have a working release callback when received over mojo

cc/ipc/copy_output_result.mojom

 // 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 "cc/ipc/texture_mailbox_releaser.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;
+  TextureMailboxWithRelease? texture_mailbox;
 };
+
+struct TextureMailboxWithRelease {
+  TextureMailbox texture_mailbox;
+  TextureMailboxReleaser releaser;
+};