Split GL binding init into core and extension part

ui/gfx/gl/gl_implementation_mac.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 "base/base_paths.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/mac/foundation_util.h"
 #include "base/native_library.h"
@@ skipping 78 matching lines @@
       InitializeGLBindingsGL();
       break;
     }
     default:
       return false;
   }
 
   return true;
 }
 
+bool InitializeGLExtensionBindings(GLImplementation implementation,
+    GLContext* context) {
+  switch (implementation) {
+    case kGLImplementationOSMesaGL:
+      InitializeGLExtensionBindingsGL(context);
+      InitializeGLExtensionBindingsOSMESA(context);
+      break;
+    case kGLImplementationDesktopGL:
+      InitializeGLExtensionBindingsGL(context);
+      break;
+    case kGLImplementationMockGL:
+      InitializeGLExtensionBindingsGL(context);
+      break;
+    default:
+      return false;
+  }
+
+  return true;
+}
+
 void InitializeDebugGLBindings() {
   InitializeDebugGLBindingsGL();
   InitializeDebugGLBindingsOSMESA();
 }
 
 }  // namespace gfx