Split GL binding init into core and extension part

ui/gfx/gl/gl_context_glx.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.
 
 extern "C" {
 #include <X11/Xlib.h>
 }
 
 #include "ui/gfx/gl/gl_context_glx.h"
 
@@ skipping 159 matching lines @@
   if (!glXMakeCurrent(
       GLSurfaceGLX::GetDisplay(),
       reinterpret_cast<GLXDrawable>(surface->GetHandle()),
       static_cast<GLXContext>(context_))) {
     LOG(ERROR) << "Couldn't make context current with X drawable.";
     Destroy();
     return false;
   }
 
   SetCurrent(this, surface);
+  if (!InitializeExtensionBindings()) {
+    ReleaseCurrent(surface);
+    return false;
+  }
+
   if (!surface->OnMakeCurrent(this)) {
     LOG(ERROR) << "Could not make current.";
     return false;
   }
 
   return true;
 }
 
 void GLContextGLX::ReleaseCurrent(GLSurface* surface) {
   if (!IsCurrent(surface))
@@ skipping 62 matching lines @@
   }
 
   return GLContext::GetExtensions();
 }
 
 bool GLContextGLX::WasAllocatedUsingARBRobustness() {
   return GLSurfaceGLX::IsCreateContextRobustnessSupported();
 }
 
 }  // namespace gfx