Record some foreign fetch registration metrics.

content/browser/service_worker/service_worker_metrics.h

Index: content/browser/service_worker/service_worker_metrics.h
diff --git a/content/browser/service_worker/service_worker_metrics.h b/content/browser/service_worker/service_worker_metrics.h
index 11522bd3324e680dff54bd659127ec6f12402fed..0909bcbc0672da6f7d661434b93c7a6500cdd353 100644
--- a/content/browser/service_worker/service_worker_metrics.h
+++ b/content/browser/service_worker/service_worker_metrics.h
@@ -195,6 +195,9 @@ class ServiceWorkerMetrics {
                                         bool is_shutdown);
   static void RecordInstallEventStatus(ServiceWorkerStatusCode status);
 
+  static void RecordForeignFetchRegistrationCount(size_t scope_count,
+                                                  size_t origin_count);
+
   // Records how much of dispatched events are handled while a Service
   // Worker is awake (i.e. after it is woken up until it gets stopped).
   static void RecordEventHandledRatio(EventType event,