Expose a method in VariationsService to trigger a seed fetch.

chrome/browser/metrics/variations/variations_request_scheduler_mobile.h

Index: chrome/browser/metrics/variations/variations_request_scheduler_mobile.h
diff --git a/chrome/browser/metrics/variations/variations_request_scheduler_mobile.h b/chrome/browser/metrics/variations/variations_request_scheduler_mobile.h
index 56d4f4d0a35d3b918f4742c865fc47a18863a464..c2222064aa9695f7f2ff5d69d43eb2f16b408388 100644
--- a/chrome/browser/metrics/variations/variations_request_scheduler_mobile.h
+++ b/chrome/browser/metrics/variations/variations_request_scheduler_mobile.h
@@ -25,11 +25,25 @@ class VariationsRequestSchedulerMobile : public VariationsRequestScheduler {
   // Base class overrides.
   virtual void Start() OVERRIDE;
   virtual void Reset() OVERRIDE;
+  virtual void OnAppEnterForeground() OVERRIDE;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(VariationsRequestSchedulerMobileTest,
+                           OnAppEnterForegroundNoRun);
+  FRIEND_TEST_ALL_PREFIXES(VariationsRequestSchedulerMobileTest,
+                           OnAppEnterForegroundRun);
+  FRIEND_TEST_ALL_PREFIXES(VariationsRequestSchedulerMobileTest,
+                           OnAppEnterForegroundOnStartup);
+
   // The local state instance that provides the last fetch time.
   PrefService* local_state_;
 
+  // Timer used for triggering a delayed fetch for ScheduleFetch().
+  base::OneShotTimer<VariationsRequestSchedulerMobile> schedule_fetch_timer_;
+
+  // The time the last seed request was initiated.
+  base::Time last_request_time_;
+
   DISALLOW_COPY_AND_ASSIGN(VariationsRequestSchedulerMobile);
 };