Add a unique frame id and save it on HistoryItem.

Source/web/WebPagePopupImpl.cpp

 /*
  * Copyright (C) 2012 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 186 matching lines @@
 
     m_page = adoptPtr(new Page(pageClients));
     m_page->settings().setScriptEnabled(true);
     m_page->settings().setAllowScriptsToCloseWindows(true);
     m_page->setDeviceScaleFactor(m_webView->deviceScaleFactor());
     m_page->settings().setDeviceSupportsTouch(m_webView->page()->settings().deviceSupportsTouch());
 
     static ContextFeaturesClient* pagePopupFeaturesClient =  new PagePopupFeaturesClient();
     provideContextFeaturesTo(m_page.get(), pagePopupFeaturesClient);
     static FrameLoaderClient* emptyFrameLoaderClient =  new EmptyFrameLoaderClient();
-    RefPtr<Frame> frame = Frame::create(m_page.get(), 0, emptyFrameLoaderClient);
+    RefPtr<Frame> frame = Frame::create(FrameInit::create(0, m_page.get(), emptyFrameLoaderClient));
     frame->setView(FrameView::create(frame.get()));
     frame->init();
     frame->view()->resize(m_popupClient->contentSize());
     frame->view()->setTransparent(false);
 
     DOMWindowPagePopup::install(frame->domWindow(), m_popupClient);
 
     DocumentWriter* writer = frame->loader().activeDocumentLoader()->beginWriting("text/html", "UTF-8");
     m_popupClient->writeDocument(*writer);
     frame->loader().activeDocumentLoader()->endWriting(writer);
@@ skipping 124 matching lines @@
     // A WebPagePopupImpl instance usually has two references.
     //  - One owned by the instance itself. It represents the visible widget.
     //  - One owned by a WebViewImpl. It's released when the WebViewImpl ask the
     //    WebPagePopupImpl to close.
     // We need them because the closing operation is asynchronous and the widget
     // can be closed while the WebViewImpl is unaware of it.
     return adoptRef(new WebPagePopupImpl(client)).leakRef();
 }
 
 } // namespace WebKit