cc: Return resources to child compositor via a Callback.

cc/resources/return_callback.h

Index: cc/resources/return_callback.h
diff --git a/cc/resources/return_callback.h b/cc/resources/return_callback.h
new file mode 100644
index 0000000000000000000000000000000000000000..d12254bd662600abbc5788dbf12d5847c5b7595b
--- /dev/null
+++ b/cc/resources/return_callback.h
@@ -0,0 +1,17 @@
+// Copyright 2013 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_RETURN_CALLBACK_H_
+#define CC_RESOURCES_RETURN_CALLBACK_H_
+
+#include "base/callback.h"
+#include "cc/resources/returned_resource.h"
+
+namespace cc {
+
+typedef base::Callback<void(const ReturnedResourceArray&)> ReturnCallback;
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_RETURN_CALLBACK_H_