Adding a field trial for testing --force-compositing-mode on 50% of

chrome/browser/chrome_browser_main.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_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1084 matching lines @@
   if (!proxy_policy_is_set)
     ProxyConnectionsFieldTrial();
   prerender::ConfigurePrefetchAndPrerender(parsed_command_line());
   SpdyFieldTrial();
   ConnectBackupJobsFieldTrial();
   WarmConnectionFieldTrial();
   PredictorFieldTrial();
   DefaultAppsFieldTrial();
   AutoLaunchChromeFieldTrial();
   DomainBoundCertsFieldTrial();
+  gpu_util::InitializeForceCompositingModeFieldTrial();
   SetupUniformityFieldTrials();
   AutocompleteFieldTrial::Activate();
 }
 
 void ChromeBrowserMainParts::StartMetricsRecording() {
   MetricsService* metrics = g_browser_process->metrics_service();
   if (parsed_command_line_.HasSwitch(switches::kMetricsRecordingOnly) ||
       parsed_command_line_.HasSwitch(switches::kEnableBenchmarking)) {
     // If we're testing then we don't care what the user preference is, we turn
     // on recording, but not reporting, otherwise tests fail.
@@ skipping 890 matching lines @@
     if (base::win::GetVersion() <= base::win::VERSION_XP)
       uma_name += "_XP";
 
     uma_name += "_PreRead_";
     uma_name += pre_read_percentage;
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }