Add common GLFence::IsSupported() check

ui/gl/gl_gl_api_implementation.cc

 // Copyright (c) 2012 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/gl/gl_gl_api_implementation.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 270 matching lines @@
 }
 
 void SetGLToRealGLApi() {
   SetGLApi(g_gl);
 }
 
 void SetGLApiToNoContext() {
   SetGLApi(g_no_context_gl);
 }
 
+const GLVersionInfo* GetGLVersionInfo() {
+  return g_version_info;
+}
+
 void InitializeDynamicGLBindingsGL(GLContext* context) {
   g_driver_gl.InitializeCustomDynamicBindings(context);
   DCHECK(context && context->IsCurrent(NULL) && !g_version_info);
   g_version_info = new GLVersionInfo(context->GetGLVersion().c_str(),
       context->GetGLRenderer().c_str());
 }
 
 void InitializeDebugGLBindingsGL() {
   g_driver_gl.InitializeDebugBindings();
 }
@@ skipping 181 matching lines @@
   GLApiBase::glFlushFn();
   GLApiBase::SignalFlush();
 }
 
 void VirtualGLApi::glFinishFn() {
   GLApiBase::glFinishFn();
   GLApiBase::SignalFlush();
 }
 
 }  // namespace gfx