ExtendableEvent and InstallEvent should have an EventConstructor

Source/modules/serviceworkers/ExtendableEvent.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/serviceworkers/WaitUntilObserver.h"
 
 namespace blink {
 
 PassRefPtrWillBeRawPtr<ExtendableEvent> ExtendableEvent::create()
 {
     return adoptRefWillBeNoop(new ExtendableEvent());
 }
 
-PassRefPtrWillBeRawPtr<ExtendableEvent> ExtendableEvent::create(const AtomicString& type, const EventInit& eventInit, WaitUntilObserver* observer)
+PassRefPtrWillBeRawPtr<ExtendableEvent> ExtendableEvent::create(const AtomicString& type, const ExtendableEventInit& eventInit)
+{
+    return adoptRefWillBeNoop(new ExtendableEvent(type, eventInit));
+}
+
+PassRefPtrWillBeRawPtr<ExtendableEvent> ExtendableEvent::create(const AtomicString& type, const ExtendableEventInit& eventInit, WaitUntilObserver* observer)
 {
     return adoptRefWillBeNoop(new ExtendableEvent(type, eventInit, observer));
 }
 
 ExtendableEvent::~ExtendableEvent()
 {
 }
 
 void ExtendableEvent::waitUntil(ScriptState* scriptState, const ScriptValue& value)
 {
-    m_observer->waitUntil(scriptState, value);
+    if (m_observer)
+        m_observer->waitUntil(scriptState, value);
 }
 
 ExtendableEvent::ExtendableEvent()
 {
 }
 
-ExtendableEvent::ExtendableEvent(const AtomicString& type, const EventInit& initializer, WaitUntilObserver* observer)
+ExtendableEvent::ExtendableEvent(const AtomicString& type, const ExtendableEventInit& initializer)
+    : Event(type, initializer)
+{
+}
+
+ExtendableEvent::ExtendableEvent(const AtomicString& type, const ExtendableEventInit& initializer, WaitUntilObserver* observer)
     : Event(type, initializer)
     , m_observer(observer)
 {
 }
 
 const AtomicString& ExtendableEvent::interfaceName() const
 {
     return EventNames::ExtendableEvent;
 }
 
 void ExtendableEvent::trace(Visitor* visitor)
 {
     visitor->trace(m_observer);
     Event::trace(visitor);
 }
 
 } // namespace blink