CopyOutputResult must have a working release callback when received over mojo

cc/ipc/single_release_callback.mojom

Index: cc/ipc/single_release_callback.mojom
diff --git a/cc/ipc/single_release_callback.mojom b/cc/ipc/single_release_callback.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..3406f4df2a197499b8d051eccd3db7ee5857a9f8
--- /dev/null
+++ b/cc/ipc/single_release_callback.mojom
@@ -0,0 +1,11 @@
+// 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_releaser.mojom";
+
+struct SingleReleaseCallback {
+  TextureMailboxReleaser releaser;
+};