Send compositor frame IPC with metadata.

cc/gl_frame_data.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_
+#ifndef CC_GL_FRAME_DATA_H_
+#define CC_GL_FRAME_DATA_H_
 
+#include <string>
+
+#include "base/basictypes.h"
 #include "cc/cc_export.h"
 #include "cc/transferable_resource.h"
 
 namespace cc {
 
-class CC_EXPORT CompositorFrameAck {
+class CC_EXPORT GLFrameData {
  public:
-  CompositorFrameAck();
-  ~CompositorFrameAck();
+  GLFrameData();
+  ~GLFrameData();
 
-  TransferableResourceList resources;
+  Mailbox mailbox;
+  uint32 sync_point;
 };
 
 }  // namespace cc
 
-#endif  // CC_COMPOSITOR_FRAME_ACK_H_
+#endif  // CC_GL_FRAME_DATA_H_