Add support to GrGLInterface for vertex array objects

src/gpu/gl/debug/GrVertexArrayObj.h

Index: src/gpu/gl/debug/GrVertexArrayObj.h
===================================================================
--- src/gpu/gl/debug/GrVertexArrayObj.h	(revision 0)
+++ src/gpu/gl/debug/GrVertexArrayObj.h	(revision 0)
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrVertexArrayObj_DEFINED
+#define GrVertexArrayObj_DEFINED
+
+#include "GrFakeRefObj.h"
+
+class GrVertexArrayObj : public GrFakeRefObj {
+    GR_DEFINE_CREATOR(GrVertexArrayObj);
+
+public:
+    GrVertexArrayObj() : GrFakeRefObj() {}
+
+    typedef GrFakeRefObj INHERITED;
+};
+#endif