Support variations_seed parameter in MasterPrefs.

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 931 matching lines @@
     //    (first run) UI is undesired.
     do_first_run_tasks_ = (
         !force_skip_first_run_tasks &&
         pmp_result != first_run::SKIP_FIRST_RUN_TASKS &&
         !parsed_command_line().HasSwitch(switches::kApp) &&
         !parsed_command_line().HasSwitch(switches::kAppId) &&
         !parsed_command_line().HasSwitch(switches::kShowAppList));
 
     if (do_first_run_tasks_) {
       AddFirstRunNewTabs(browser_creator_.get(), master_prefs_->new_tabs);
+
+      // Store the initial VariationsService seed in local state, if it exists
+      // in master prefs.
+      if (!master_prefs_->variations_seed.empty()) {
+        local_state_->SetString(prefs::kVariationsSeed,
+                                master_prefs_->variations_seed);
+        // Set the variation seed date to the current system time. If the user's
+        // clock is incorrect, this may cause some field trial expiry checks to
+        // not do the right thing until the next seed update from the server,
+        // when this value will be updated.
+        local_state_->SetInt64(prefs::kVariationsSeedDate,
+                               base::Time::Now().ToInternalValue());
+      }
     } else if (parsed_command_line().HasSwitch(switches::kNoFirstRun)) {
       // Create the First Run beacon anyways if --no-first-run was passed on the
       // command line.
       first_run::CreateSentinel();
     }
   }
 #endif
 
   // TODO(viettrungluu): why don't we run this earlier?
   if (!parsed_command_line().HasSwitch(switches::kNoErrorDialogs))
@@ skipping 823 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
 }