Introduce ServiceWorker.EventDispatchingDelay UMA

third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h

 // 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.
 
 #ifndef WaitUntilObserver_h
 #define WaitUntilObserver_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "modules/ModulesExport.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
@@ skipping 46 matching lines @@
     class ThenFunction;
 
     WaitUntilObserver(ExecutionContext*, EventType, int eventID);
 
     void reportError(const ScriptValue&);
 
     void consumeWindowInteraction(TimerBase*);
 
     EventType m_type;
     int m_eventID;
-    int m_pendingActivity;
-    bool m_hasError;
-    bool m_eventDispatched;
+    int m_pendingActivity = 0;
+    bool m_hasError = false;
+    bool m_eventDispatched = false;
+    double m_eventDispatchTime = 0;
     Timer<WaitUntilObserver> m_consumeWindowInteractionTimer;
 };
 
 } // namespace blink
 
 #endif // WaitUntilObserver_h