Update ServiceWorker event handled status histogram

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 c0d882d3901da91410eabf4b8c48ea3ffdae0018..64e62bbf6d1258989bfa0bb9d28f2a8d3a5f5435 100644
--- a/content/browser/service_worker/service_worker_metrics.cc
+++ b/content/browser/service_worker/service_worker_metrics.cc
@@ -21,6 +21,19 @@ void RecordURLMetricOnUI(const GURL& url) {
       "ServiceWorker.ControlledPageUrl", url);
 }
 
+enum EventHandledStatus {
+  EVENT_HANDLED,
+  EVENT_NOT_HANDLED,
+  EVENT_HANDLED_STATUS_MAX,
+};
+
+enum PerWorkerEventHandledStatus {
+  NO_EVENTS_HANDLED,
+  SOME_EVENTS_HANDLED,
+  ALL_EVENTS_HANDLED,
+  PER_WORKER_EVENT_HANDLED_STATUS_MAX,
+};
+
 }  // namespace
 
 void ServiceWorkerMetrics::CountInitDiskCacheResult(bool result) {
@@ -107,13 +120,28 @@ void ServiceWorkerMetrics::RecordInstallEventStatus(
                             SERVICE_WORKER_ERROR_MAX_VALUE);
 }
 
-void ServiceWorkerMetrics::RecordEventStatus(size_t fired_events,
-                                             size_t handled_events) {
+void ServiceWorkerMetrics::RecordPerWorkerEventHandledStatus(
+    size_t fired_events,
+    size_t handled_events) {
   if (!fired_events)
     return;
-  int unhandled_ratio = (fired_events - handled_events) * 100 / fired_events;
-  UMA_HISTOGRAM_PERCENTAGE("ServiceWorker.UnhandledEventRatio",
-                           unhandled_ratio);
+  PerWorkerEventHandledStatus status = SOME_EVENTS_HANDLED;
+  if (fired_events == handled_events)
+    status = ALL_EVENTS_HANDLED;
+  else if (handled_events == 0)
+    status = NO_EVENTS_HANDLED;
+  UMA_HISTOGRAM_ENUMERATION("ServiceWorker.EventHandledStatus_PerWorker",
+                            status, PER_WORKER_EVENT_HANDLED_STATUS_MAX);
+}
+
+void ServiceWorkerMetrics::RecordEventHandledStatus(bool handled) {
+  if (handled) {
+    UMA_HISTOGRAM_ENUMERATION("ServiceWorker.EventHandledStatus", EVENT_HANDLED,
+                              EVENT_HANDLED_STATUS_MAX);
+  } else {
+    UMA_HISTOGRAM_ENUMERATION("ServiceWorker.EventHandledStatus",
+                              EVENT_NOT_HANDLED, EVENT_HANDLED_STATUS_MAX);
+  }
 }
 
 }  // namespace content