Split GL binding init into core and extension part

ui/gfx/gl/gl_context_osmesa.cc

 // Copyright (c) 2011 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.
 
 #include <GL/osmesa.h>
 
 #include "ui/gfx/gl/gl_context_osmesa.h"
 
 #include "base/logging.h"
 #include "ui/gfx/gl/gl_bindings.h"
@@ skipping 52 matching lines @@
                          size.height())) {
     LOG(ERROR) << "OSMesaMakeCurrent failed.";
     Destroy();
     return false;
   }
 
   // Row 0 is at the top.
   OSMesaPixelStore(OSMESA_Y_UP, 0);
 
   SetCurrent(this, surface);
+  if (!InitializeExtensionBindings()) {
+    ReleaseCurrent(surface);
+    return false;
+  }
+
   if (!surface->OnMakeCurrent(this)) {
     LOG(ERROR) << "Could not make current.";
     return false;
   }
 
   return true;
 }
 
 void GLContextOSMesa::ReleaseCurrent(GLSurface* surface) {
   if (!IsCurrent(surface))
@@ skipping 33 matching lines @@
 void* GLContextOSMesa::GetHandle() {
   return context_;
 }
 
 void GLContextOSMesa::SetSwapInterval(int interval) {
   DCHECK(IsCurrent(NULL));
   LOG(WARNING) << "GLContextOSMesa::SetSwapInterval is ignored.";
 }
 
 }  // namespace gfx