Mojo: Use new message APIs to reduce copying

mojo/public/cpp/system/message.cc

Index: mojo/public/cpp/system/message.cc
diff --git a/ui/gl/gl_image.cc b/mojo/public/cpp/system/message.cc
similarity index 57%
copy from ui/gl/gl_image.cc
copy to mojo/public/cpp/system/message.cc
index b74aa83280aac15363d7da4828b83e84bbe6667c..09d8d46e6dd15407bd123489ab8bdacdfef381c6 100644
--- a/ui/gl/gl_image.cc
+++ b/mojo/public/cpp/system/message.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gl/gl_image.h"
+#include "mojo/public/cpp/system/message.h"
 
-namespace gl {
+namespace mojo {
+
+ScopedMessageHandle::~ScopedMessageHandle() {
 
-bool GLImage::EmulatingRGB() const {
-  return false;
 }
 
-}  // namespace gl
+}  // namespace mojo