adds WARP support to Chromium, for Metro mode only, on Windows 8

chrome/browser/gpu/gpu_pref_manager.h

 // 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.
 
-#ifndef CHROME_BROWSER_GPU_GL_STRING_MANAGER_H_
-#define CHROME_BROWSER_GPU_GL_STRING_MANAGER_H_
+#ifndef CHROME_BROWSER_GPU_GPU_PREF_MANAGER_H_
+#define CHROME_BROWSER_GPU_GPU_PREF_MANAGER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
 
 class PrefRegistrySimple;
 
-class GLStringManager : public content::GpuDataManagerObserver {
+class GpuPrefManager : public content::GpuDataManagerObserver {
  public:
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
-  GLStringManager();
-  virtual ~GLStringManager();
+  GpuPrefManager();
+  virtual ~GpuPrefManager();
 
-  // Get cached GL strings in local state and send them to GpuDataManager.
+  // Get cached strings in local state and send them to GpuDataManager.
   void Initialize();
 
   // content::GpuDataManagerObserver
   virtual void OnGpuInfoUpdate() OVERRIDE;
 
  private:
   std::string gl_vendor_;
   std::string gl_renderer_;
   std::string gl_version_;
+  bool use_warp_;
 
-  DISALLOW_COPY_AND_ASSIGN(GLStringManager);
+  DISALLOW_COPY_AND_ASSIGN(GpuPrefManager);
 };
 
-#endif  // CHROME_BROWSER_GPU_GL_STRING_MANAGER_H_
+#endif  // CHROME_BROWSER_GPU_GPU_PREF_MANAGER_H_