Split GL binding init into core and extension part

ui/gfx/gl/gl_context_cgl.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 "ui/gfx/gl/gl_context_cgl.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "ui/gfx/gl/gl_bindings.h"
@@ skipping 85 matching lines @@
     return false;
   }
 
   if (CGLSetCurrentContext(
       static_cast<CGLContextObj>(context_)) != kCGLNoError) {
     LOG(ERROR) << "Unable to make gl context current.";
     return false;
   }
 
   SetCurrent(this, surface);
+  if (!InitializeExtensionBindings()) {
+    ReleaseCurrent(surface);
+    return false;
+  }
+
   if (!surface->OnMakeCurrent(this)) {
     LOG(ERROR) << "Unable to make gl context current.";
     return false;
   }
 
   return true;
 }
 
 void GLContextCGL::ReleaseCurrent(GLSurface* surface) {
   if (!IsCurrent(surface))
@@ skipping 39 matching lines @@
 void GLContextCGL::SetSwapInterval(int interval) {
   DCHECK(IsCurrent(NULL));
   LOG(WARNING) << "GLContex: GLContextCGL::SetSwapInterval is ignored.";
 }
 
 GpuPreference GLContextCGL::GetGpuPreference() {
   return gpu_preference_;
 }
 
 }  // namespace gfx