ServiceWorker: Add UMA for Activate and Install event results.

content/browser/service_worker/service_worker_metrics.cc

Index: content/browser/service_worker/service_worker_metrics.cc
diff --git a/content/browser/service_worker/service_worker_metrics.cc b/content/browser/service_worker/service_worker_metrics.cc
index 69f0d858eaca8af35148ed1a4d98786a97e00a3a..dc3c157ab2cc9310699590c828902b3d442c97b4 100644
--- a/content/browser/service_worker/service_worker_metrics.cc
+++ b/content/browser/service_worker/service_worker_metrics.cc
@@ -95,4 +95,16 @@ void ServiceWorkerMetrics::RecordStartWorkerTime(const base::TimeDelta& time,
     UMA_HISTOGRAM_MEDIUM_TIMES("ServiceWorker.StartNewWorker.Time", time);
 }
 
+void ServiceWorkerMetrics::RecordActivateEventStatus(
+    ServiceWorkerStatusCode status) {
+  UMA_HISTOGRAM_ENUMERATION("ServiceWorker.ActivateEventStatus", status,
+                            SERVICE_WORKER_ERROR_MAX_VALUE);
+}
+
+void ServiceWorkerMetrics::RecordInstallEventStatus(
+    ServiceWorkerStatusCode status) {
+  UMA_HISTOGRAM_ENUMERATION("ServiceWorker.InstallEventStatus", status,
+                            SERVICE_WORKER_ERROR_MAX_VALUE);
+}
+
 }  // namespace content