Add support to GrGLInterface for vertex array objects

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 331 matching lines @@
             return false;
         }
     }
 
     if (kDesktop_GrGLBinding == binding && glVer >= GR_GL_VER(3, 0)) {
         if (NULL == fGetStringi) {
             return false;
         }
     }
 
+    if (kDesktop_GrGLBinding == binding) {
+        if (glVer >= GR_GL_VER(3, 0) || extensions.has("GL_ARB_vertex_array_object")) {
+            if (NULL == fBindVertexArray ||
+                NULL == fDeleteVertexArrays ||
+                NULL == fGenVertexArrays) {
+                return false;
+            }
+        }
+    } else {
+#if 0 // Remove this #if once Chromium interfaces set these pointers
+        if (extensions.has("GL_OES_vertex_array_object")) {
+            if (NULL == fBindVertexArray ||
+                NULL == fDeleteVertexArrays ||
+                NULL == fGenVertexArrays) {
+                return false;
+            }
+        }
+#endif
+    }
+
     return true;
 }