Respect the smooth scrolling setting in LayerScrollableArea.

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 225 matching lines @@
     m_chromeClient = adoptPtr(new PagePopupChromeClient(this));
     pageClients.chromeClient = m_chromeClient.get();
 
     m_page = adoptPtrWillBeNoop(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());
     // FIXME: Should we support enabling a11y while a popup is shown?
     m_page->settings().setAccessibilityEnabled(m_webView->page()->settings().accessibilityEnabled());
+    m_page->settings().setScrollAnimatorEnabled(m_webView->page()->settings().scrollAnimatorEnabled());
 
     provideContextFeaturesTo(*m_page, adoptPtr(new PagePopupFeaturesClient()));
     static FrameLoaderClient* emptyFrameLoaderClient = new EmptyFrameLoaderClient();
     RefPtrWillBeRawPtr<LocalFrame> frame = LocalFrame::create(emptyFrameLoaderClient, &m_page->frameHost(), 0);
     frame->setPagePopupOwner(m_popupClient->ownerElement());
     frame->setView(FrameView::create(frame.get()));
     frame->init();
     frame->view()->resize(m_popupClient->contentSize());
     frame->view()->setTransparent(false);
     if (AXObjectCache* cache = m_popupClient->ownerElement().document().existingAXObjectCache())
@@ skipping 228 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 blink