Send compositor frame IPC with metadata.

cc/gl_frame_data.h

Index: cc/gl_frame_data.h
diff --git a/cc/compositor_frame_ack.h b/cc/gl_frame_data.h
similarity index 54%
copy from cc/compositor_frame_ack.h
copy to cc/gl_frame_data.h
index 0f73c162bb1ffc50e7e8a8ad664f0447a372af2e..987f5af48f34dc72d9e4909541e6c5117ce057fd 100644
--- a/cc/compositor_frame_ack.h
+++ b/cc/gl_frame_data.h
@@ -2,22 +2,26 @@
 // 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_