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

chrome/browser/chrome_browser_main.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_CHROME_BROWSER_MAIN_H_
 #define CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
@@ skipping 27 matching lines @@
 }
 
 namespace chrome_browser_metrics {
 class TrackingSynchronizer;
 }
 
 namespace content {
 struct MainFunctionParams;
 }
 
+namespace chrome_browser_trials {
+extern bool g_in_force_compositing_mode_trial;
+}
+
 class ChromeBrowserMainParts : public content::BrowserMainParts {
  public:
   virtual ~ChromeBrowserMainParts();
 
   // Add additional ChromeBrowserMainExtraParts.
   virtual void AddParts(ChromeBrowserMainExtraParts* parts);
 
  protected:
   explicit ChromeBrowserMainParts(
       const content::MainFunctionParams& parameters);
@@ skipping 64 matching lines @@
   // has on retention and general apps/webstore usage.
   void DefaultAppsFieldTrial();
 
   // A field trial to see what effects launching Chrome automatically on
   // computer startup has on retention and usage of Chrome.
   void AutoLaunchChromeFieldTrial();
 
   // Field trial for testing domain bound certs.
   void DomainBoundCertsFieldTrial();
 
+  // Field trial for testing compositing on all pages.
+  void ForceCompositingModeFieldTrial();
+
   // A collection of field trials intended to test the uniformity and
   // correctness of the field trial control, bucketing and reporting systems.
   void SetupUniformityFieldTrials();
 
   // Methods for |SetupMetricsAndFieldTrials()| --------------------------------
 
   // Constructs metrics service and does related initialization, including
   // creation of field trials. Call only after labs have been converted to
   // switches.
   void SetupMetricsAndFieldTrials();
@@ skipping 94 matching lines @@
 // Records the time from our process' startup to the present time in
 // the UMA histogram |metric_name|.
 void RecordBrowserStartupTime();
 
 // Records a time value to an UMA histogram in the context of the
 // PreReadExperiment field-trial. This also reports to the appropriate
 // sub-histogram (_PreRead(Enabled|Disabled)).
 void RecordPreReadExperimentTime(const char* name, base::TimeDelta time);
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_H_