Expose CHROMIUM_texture_mailbox/sync_point stubs in mojo public headers

mojo/public/c/gles2/chromium_sync_point.h

Index: mojo/public/c/gles2/chromium_sync_point.h
diff --git a/mojo/public/c/gles2/chromium_sync_point.h b/mojo/public/c/gles2/chromium_sync_point.h
new file mode 100644
index 0000000000000000000000000000000000000000..63697125490ed72ced9e341311ef6f2e89a56f75
--- /dev/null
+++ b/mojo/public/c/gles2/chromium_sync_point.h
@@ -0,0 +1,30 @@
+// Copyright 2014 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 MOJO_PUBLIC_C_GLES2_CHROMIUM_SYNC_POINT_H_
+#define MOJO_PUBLIC_C_GLES2_CHROMIUM_SYNC_POINT_H_
+
+// Note: This header should be compilable as C.
+
+#include <stdint.h>
+#include <GLES2/gl2.h>
+
+#include "mojo/public/c/gles2/gles2_export.h"
+#include "mojo/public/c/gles2/gles2_types.h"
+#include "mojo/public/c/system/types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  MOJO_GLES2_EXPORT ReturnType GL_APIENTRY gl##Function PARAMETERS;
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_sync_point_autogen.h"
+#undef VISIT_GL_CALL
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // MOJO_PUBLIC_C_GLES2_CHROMIUM_SYNC_POINT_H_