Send compositor frame IPC with metadata.

cc/gl_compositor_frame.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_GL_COMPOSITOR_FRAME_H_
+#define CC_GL_COMPOSITOR_FRAME_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "cc/cc_export.h"
+#include "cc/compositor_frame.h"
+
+namespace cc {
+
+class CC_EXPORT GLCompositorFrame : public CompositorFrame {
+ public:
+  GLCompositorFrame();
+  ~GLCompositorFrame();
+
+  std::string mailbox_name;
+  uint32 sync_point;
+};
+
+}  // namespace cc
+
+#endif  // CC_GL_COMPOSITOR_FRAME_H_