Expose a method in VariationsService to trigger a seed fetch.

chrome/browser/metrics/variations/variations_service.cc

Index: chrome/browser/metrics/variations/variations_service.cc
diff --git a/chrome/browser/metrics/variations/variations_service.cc b/chrome/browser/metrics/variations/variations_service.cc
index 1494d3bdab94aaff185911e0fbf9a5968b783cdd..44fe458488a0cd8a9ef8c2194aad5b2fbae8f952 100644
--- a/chrome/browser/metrics/variations/variations_service.cc
+++ b/chrome/browser/metrics/variations/variations_service.cc
@@ -257,6 +257,15 @@ void VariationsService::StartRepeatedVariationsSeedFetch() {
   request_scheduler_->Start();
 }
 
+// TODO(rkaplow): Handle this and the similar event in metrics_service by
+// observing an 'OnAppEnterForeground' event in RequestScheduler instead of
+// requiring the frontend code to notify each service individually. Since the
+// scheduler will handle it directly the VariationService shouldn't need to
+// know details of this anymore.
+void VariationsService::OnAppEnterForeground() {
+  request_scheduler_->OnAppEnterForeground();
+}
+
 // static
 GURL VariationsService::GetVariationsServerURL(PrefService* local_state) {
   std::string server_url_string(CommandLine::ForCurrentProcess()->