Expose a method in VariationsService to trigger a seed fetch.

chrome/browser/metrics/variations/variations_request_scheduler.h

Index: chrome/browser/metrics/variations/variations_request_scheduler.h
diff --git a/chrome/browser/metrics/variations/variations_request_scheduler.h b/chrome/browser/metrics/variations/variations_request_scheduler.h
index beb3bbf6de55f6cd4a5865f754de2c5f7d0ef5da..7d811fc7a59d17cce0838eb8966c07cfb4f48c34 100644
--- a/chrome/browser/metrics/variations/variations_request_scheduler.h
+++ b/chrome/browser/metrics/variations/variations_request_scheduler.h
@@ -19,7 +19,7 @@ class VariationsRequestScheduler {
  public:
   virtual ~VariationsRequestScheduler();
 
-  // Starts the task on a schedule.
+  // Starts the task. This can be a repeated event or a one-off.
   virtual void Start();
 
   // Resets the scheduler if it is currently on a timer.
@@ -27,7 +27,11 @@ class VariationsRequestScheduler {
 
   // Schedules a fetch shortly, for example to re-try the initial request which
   // may have failed.
-  void ScheduleFetchShortly();
+  void ForceFetch();
+
+  // Potentially fetch a new seed, depending on implementation. This may only
+  // fetch if there has not been one recently.
+  virtual void ScheduleFetch();
 
   // Factory method for this class.
   static VariationsRequestScheduler* Create(const base::Closure& task,
@@ -42,7 +46,7 @@ class VariationsRequestScheduler {
 
  private:
   FRIEND_TEST_ALL_PREFIXES(VariationsRequestSchedulerTest,
-                           ScheduleFetchShortly);
+                           ForceFetch);
 
   // The task scheduled by this class.
   base::Closure task_;