cc: Add CompositorFrame class with IPC param traits for it

cc/compositor_frame_ack.h

+// Copyright 2012 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_COMPOSITOR_FRAME_ACK_H_
+#define CC_COMPOSITOR_FRAME_ACK_H_
+
+#include "cc/cc_export.h"
+#include "cc/transferable_resource.h"
+
+namespace cc {
+
+class CC_EXPORT CompositorFrameAck {
+ public:
+  CompositorFrameAck();
+  ~CompositorFrameAck();
+
+  TransferableResourceList resources;
+};
+
+}  // namespace cc
+
+#endif  // CC_COMPOSITOR_FRAME_ACK_H_