ServiceWorker: Make a way to retrieve a service worker version id (Blink)

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 817 matching lines @@
     if (!m_webFrame->client())
         return nullptr;
     return adoptPtr(m_webFrame->client()->createServiceWorkerProvider(m_webFrame));
 }
 
 bool FrameLoaderClientImpl::isControlledByServiceWorker(DocumentLoader& loader)
 {
     return m_webFrame->client() && m_webFrame->client()->isControlledByServiceWorker(*WebDataSourceImpl::fromDocumentLoader(&loader));
 }
 
+int64_t FrameLoaderClientImpl::serviceWorkerID(DocumentLoader& loader)
+{
+    if (!m_webFrame->client())
+        return -1;
+    return m_webFrame->client()->serviceWorkerID(*WebDataSourceImpl::fromDocumentLoader(&loader));
+}
+
 SharedWorkerRepositoryClient* FrameLoaderClientImpl::sharedWorkerRepositoryClient()
 {
     return m_webFrame->sharedWorkerRepositoryClient();
 }
 
 PassOwnPtr<WebApplicationCacheHost> FrameLoaderClientImpl::createApplicationCacheHost(WebApplicationCacheHostClient* client)
 {
     if (!m_webFrame->client())
         return nullptr;
     return adoptPtr(m_webFrame->client()->createApplicationCacheHost(m_webFrame, client));
 }
 
 void FrameLoaderClientImpl::didStopAllLoaders()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didAbortLoading(m_webFrame);
 }
 
 void FrameLoaderClientImpl::dispatchDidChangeManifest()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didChangeManifest(m_webFrame);
 }
 
 } // namespace blink