Add field trial for enabling Stage3D in XP

chrome/browser/chrome_browser_field_trials.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/browser/chrome_browser_field_trials.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 106 matching lines @@
     ProxyConnectionsFieldTrial();
   prerender::ConfigurePrefetchAndPrerender(parsed_command_line_);
   instant::SetupInstantFieldTrials();
   SpdyFieldTrial();
   ConnectBackupJobsFieldTrial();
   WarmConnectionFieldTrial();
   PredictorFieldTrial();
   DefaultAppsFieldTrial();
   AutoLaunchChromeFieldTrial();
   gpu_util::InitializeCompositingFieldTrial();
+  gpu_util::InitializeStage3DFieldTrial();
   SetupUniformityFieldTrials();
   AutocompleteFieldTrial::Activate();
   DisableNewTabFieldTrialIfNecesssary();
   SetUpSafeBrowsingInterstitialFieldTrial();
   SetUpInfiniteCacheFieldTrial();
 #if defined(ENABLE_ONE_CLICK_SIGNIN)
   OneClickSigninHelper::InitializeFieldTrial();
 #endif
 }
 
@@ skipping 420 matching lines @@
   if (parsed_command_line_.HasSwitch(switches::kDisableInfiniteCache))
     infinite_cache_probability = 0;
 
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial("InfiniteCache", kDivisor,
                                                  "No", 2013, 12, 31, NULL));
   trial->UseOneTimeRandomization();
   trial->AppendGroup("Yes", infinite_cache_probability);
   trial->AppendGroup("Control", infinite_cache_probability);
 }