ServiceWorker: Store the existence of fetch event handler

third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.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 192 matching lines @@
 {
     if (!RuntimeEnabledFeatures::backgroundSyncEnabled()) {
         ServiceWorkerGlobalScopeClient::from(workerGlobalScope())->didHandleSyncEvent(eventID, WebServiceWorkerEventResultCompleted);
         return;
     }
     WaitUntilObserver* observer = WaitUntilObserver::create(workerGlobalScope(), WaitUntilObserver::Sync, eventID);
     Event* event = SyncEvent::create(EventTypeNames::sync, tag, lastChance == IsLastChance, observer);
     workerGlobalScope()->dispatchExtendableEvent(event, observer);
 }
 
+bool ServiceWorkerGlobalScopeProxy::hasFetchEventHandler()
+{
+    DCHECK(m_workerGlobalScope);
+    return m_workerGlobalScope->hasEventListeners(EventTypeNames::fetch);
+}
+
 void ServiceWorkerGlobalScopeProxy::reportException(const String& errorMessage, int lineNumber, int columnNumber, const String& sourceURL, int)
 {
     client().reportException(errorMessage, lineNumber, columnNumber, sourceURL);
 }
 
 void ServiceWorkerGlobalScopeProxy::reportConsoleMessage(ConsoleMessage* consoleMessage)
 {
     client().reportConsoleMessage(consoleMessage->source(), consoleMessage->level(), consoleMessage->message(), consoleMessage->lineNumber(), consoleMessage->url());
 }
 
@@ skipping 68 matching lines @@
     return *m_document;
 }
 
 ServiceWorkerGlobalScope* ServiceWorkerGlobalScopeProxy::workerGlobalScope() const
 {
     DCHECK(m_workerGlobalScope);
     return m_workerGlobalScope;
 }
 
 } // namespace blink