Add a new App launcher promo to the apps page / NTP.

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"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 662 matching lines @@
     bool ret = base::FieldTrialList::CreateTrialsFromString(persistent);
     CHECK(ret) << "Invalid --" << switches::kForceFieldTrials <<
                   " list specified.";
   }
 
   chrome_variations::VariationsService* variations_service =
       browser_process_->variations_service();
   if (variations_service)
     variations_service->CreateTrialsFromSeed();
 
-  const int64 install_date = local_state_->GetInt64(prefs::kInstallDate);
-  // This must be called after the pref is initialized.
-  DCHECK(install_date);
-  browser_field_trials_.SetupFieldTrials(base::Time::FromTimeT(install_date));
+  // This must be called after the local state is initialized.
+  browser_field_trials_.SetupFieldTrials(local_state_);
 
   SetupPlatformFieldTrials();
 
   // Initialize FieldTrialSynchronizer system. This is a singleton and is used
   // for posting tasks via base::Bind. Its deleted when it goes out of scope.
   // Even though base::Bind does AddRef and Release, the object will not be
   // deleted after the Task is executed.
   field_trial_synchronizer_ = new FieldTrialSynchronizer();
 }
 
@@ skipping 1117 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
 }