Expose a method in VariationsService to trigger a seed fetch.

chrome/browser/metrics/variations/variations_request_scheduler.cc

Index: chrome/browser/metrics/variations/variations_request_scheduler.cc
diff --git a/chrome/browser/metrics/variations/variations_request_scheduler.cc b/chrome/browser/metrics/variations/variations_request_scheduler.cc
index ff437a8c9d450aa7a78fac1127e4e05bc15b1048..d6aabbe9f1e4649c56ba421cdabd10d605ef1065 100644
--- a/chrome/browser/metrics/variations/variations_request_scheduler.cc
+++ b/chrome/browser/metrics/variations/variations_request_scheduler.cc
@@ -36,6 +36,11 @@ void VariationsRequestScheduler::ScheduleFetchShortly() {
                         task_);
 }
 
+void VariationsRequestScheduler::OnAppEnterForeground() {
+  // By default (non-mobile) we can reuse ScheduleFetchShortly.

[Alexei Svitkine (slow), 2014/02/13 17:36:22]

I would actually make the implementation of this be NOTREACHED();

The idea being that we don't expect this to ever be triggered on non-mobile
platforms.

[rkaplow, 2014/02/13 18:54:47]

Yeah that seems safer actually. Is this all that is needed for using
NOTREACHED()?

+  ScheduleFetchShortly();
+}
+
 base::Closure VariationsRequestScheduler::task() const {
   return task_;
 }