UMA for Notification action buttons

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/notifications/ServiceWorkerRegistrationNotifications.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ skipping 42 matching lines @@
 
     // If permission for notification's origin is not "granted", reject promise with a TypeError exception, and terminate these substeps.
     if (Notification::checkPermission(executionContext) != WebNotificationPermissionAllowed)
         return ScriptPromise::reject(scriptState, V8ThrowException::createTypeError(scriptState->isolate(), "No notification permission has been granted for this origin."));
 
     // Validate the developer-provided values to get a WebNotificationData object.
     WebNotificationData data = createWebNotificationData(executionContext, title, options, exceptionState);
     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();
 
     WebNotificationShowCallbacks* callbacks = new CallbackPromiseAdapter<void, void>(resolver);
 
     SecurityOrigin* origin = executionContext->securityOrigin();
     WebNotificationManager* notificationManager = Platform::current()->notificationManager();
     ASSERT(notificationManager);
 
     notificationManager->showPersistent(WebSecurityOrigin(origin), data, serviceWorkerRegistration.webRegistration(), callbacks);
     return promise;
 }
 
 ScriptPromise ServiceWorkerRegistrationNotifications::getNotifications(ScriptState* scriptState, ServiceWorkerRegistration& serviceWorkerRegistration, const GetNotificationOptions& options)
 {
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     WebNotificationGetCallbacks* callbacks = new CallbackPromiseAdapter<NotificationArray, void>(resolver);
 
     WebNotificationManager* notificationManager = Platform::current()->notificationManager();
     ASSERT(notificationManager);
 
     notificationManager->getNotifications(options.tag(), serviceWorkerRegistration.webRegistration(), callbacks);
     return promise;
 }
 
 } // namespace blink