UMA for Notification action buttons

third_party/WebKit/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp

Index: third_party/WebKit/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
diff --git a/third_party/WebKit/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp b/third_party/WebKit/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
index d916a0503ac76eaef6352b86f9d4853b8c0167e6..0c1193bd01fb518ba1669e1539cd8c291e514bc8 100644
--- a/third_party/WebKit/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
+++ b/third_party/WebKit/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
@@ -60,6 +60,9 @@ ScriptPromise ServiceWorkerRegistrationNotifications::showNotification(ScriptSta
     if (exceptionState.hadException())
         return exceptionState.reject(scriptState);
 
+    // Log number of actions developer provided in linear histogram: 0 -> underflow bucket, 1-16 -> distinct buckets, 17+ -> overflow bucket.
+    Platform::current()->histogramEnumeration("Notifications.PersistentNotificationActionCount", options.actions().size(), 17);
+
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();