Add a user pref in Settings to disable all GPU features.

chrome/browser/browser_process.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.
 
 // This interface is for managing the global services of the application. Each
 // service is lazily created when requested the first time. The service getters
 // will return NULL if the service is not available, so callers must check for
 // this condition.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_H_
 #define CHROME_BROWSER_BROWSER_PROCESS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "chrome/browser/ui/host_desktop.h"
 
 class AutomationProviderList;
 class BackgroundModeManager;
 class BookmarkPromptController;
 class ChromeNetLog;
 class CommandLine;
 class CRLSetFetcher;
 class ComponentUpdateService;
 class DownloadRequestLimiter;
 class DownloadStatusUpdater;
 class GLStringManager;
+class GpuModeManager;
 class IconManager;
 class IntranetRedirectDetector;
 class IOThread;
 class MetricsService;
 class NotificationUIManager;
 class PrefRegistrySimple;
 class PrefService;
 class Profile;
 class ProfileManager;
 class RenderWidgetSnapshotTaker;
@@ skipping 104 matching lines @@
   virtual policy::BrowserPolicyConnector* browser_policy_connector() = 0;
 
   // This is the main interface for chromium components to retrieve policy
   // information from the policy system.
   virtual policy::PolicyService* policy_service() = 0;
 
   virtual IconManager* icon_manager() = 0;
 
   virtual GLStringManager* gl_string_manager() = 0;
 
+  virtual GpuModeManager* gpu_mode_manager() = 0;
+
   virtual RenderWidgetSnapshotTaker* GetRenderWidgetSnapshotTaker() = 0;
 
   virtual AutomationProviderList* GetAutomationProviderList() = 0;
 
   virtual void CreateDevToolsHttpProtocolHandler(
       Profile* profile,
       chrome::HostDesktopType host_desktop_type,
       const std::string& ip,
       int port,
       const std::string& frontend_url) = 0;
@@ skipping 60 matching lines @@
   virtual void PlatformSpecificCommandLineProcessing(
       const CommandLine& command_line) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserProcess);
 };
 
 extern BrowserProcess* g_browser_process;
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_H_