Add the navigator.serviceWorker.waiting property.

Source/modules/serviceworkers/ServiceWorker.cpp

 /*
  * Copyright (C) 2013 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 119 matching lines @@
     case blink::WebServiceWorkerStateActive:
         return active;
     case blink::WebServiceWorkerStateDeactivated:
         return deactivated;
     default:
         ASSERT_NOT_REACHED();
         return nullAtom;
     }
 }
 
-PassRefPtr<ServiceWorker> ServiceWorker::from(ScriptState* scriptState, WebType* worker)
+PassRefPtr<ServiceWorker> ServiceWorker::from(ExecutionContext* executionContext, WebType* worker)
 {
     blink::WebServiceWorkerProxy* proxy = worker->proxy();
     ServiceWorker* existingServiceWorker = proxy ? proxy->unwrap() : 0;
     if (existingServiceWorker) {
-        ASSERT(existingServiceWorker->executionContext() == scriptState->executionContext());
+        ASSERT(existingServiceWorker->executionContext() == executionContext);
         return existingServiceWorker;
     }
 
-    return create(scriptState->executionContext(), adoptPtr(worker));
+    return create(executionContext, adoptPtr(worker));
 }
 
 PassRefPtr<ServiceWorker> ServiceWorker::from(ScriptPromiseResolverWithContext* resolver, WebType* worker)
 {
-    RefPtr<ServiceWorker> serviceWorker = ServiceWorker::from(resolver->scriptState(), worker);
+    RefPtr<ServiceWorker> serviceWorker = ServiceWorker::from(resolver->scriptState()->executionContext(), worker);
 
     ScriptState::Scope scope(resolver->scriptState());
     serviceWorker->waitOnPromise(resolver->promise());
 
     return serviceWorker;
 }
 
 void ServiceWorker::onPromiseResolved()
 {
     ASSERT(m_isPromisePending);
@@ skipping 21 matching lines @@
     , WebServiceWorkerProxy(this)
     , m_outerWorker(worker)
     , m_isPromisePending(false)
 {
     ScriptWrappable::init(this);
     ASSERT(m_outerWorker);
     m_outerWorker->setProxy(this);
 }
 
 } // namespace WebCore