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

chrome/common/pref_names.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 "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 2145 matching lines @@
 // uninstalling background apps.
 const char kUserCreatedLoginItem[] = "background_mode.user_created_login_item";
 
 // Set to true if the user removed our login item so we should not create a new
 // one when uninstalling background apps.
 const char kUserRemovedLoginItem[] = "background_mode.user_removed_login_item";
 
 // Set to true if background mode is enabled on this browser.
 const char kBackgroundModeEnabled[] = "background_mode.enabled";
 
+// Set to true if hardware acceleration mode is enabled on this browser.
+const char kHardwareAccelerationModeEnabled[] =
+  "hardware_acceleration_mode.enabled";
+
 // List of protocol handlers.
 const char kRegisteredProtocolHandlers[] =
   "custom_handlers.registered_protocol_handlers";
 
 // List of protocol handlers the user has requested not to be asked about again.
 const char kIgnoredProtocolHandlers[] =
   "custom_handlers.ignored_protocol_handlers";
 
 // Whether user-specified handlers for protocols and content types can be
 // specified.
@@ skipping 169 matching lines @@
 const char kRLZBrand[] = "rlz.brand";
 // Whether RLZ pings are disabled.
 const char kRLZDisabled[] = "rlz.disabled";
 #endif
 
 // The directory in user data dir that contains the profile to be used with the
 // app launcher.
 extern const char kAppListProfile[] = "app_list.profile";
 
 }  // namespace prefs