Reviewed by Darin Adler.

Add a synchronous display mechanism for WKCACFLayerRenderer. 

WebCore: 

* platform/graphics/win/WKCACFLayerRenderer.cpp:
(WebCore::WKCACFLayerRenderer::setRootContentsAndDisplay): This is 
just like setRootContents(), but it calls paint() instead of 
renderSoon().
* platform/graphics/win/WKCACFLayerRenderer.h:

WebKit/win: 

* Interfaces/IWebViewPrivate.idl:
* Interfaces/WebKit.idl:
* WebView.cpp:
(WebView::WebView):
(WebView::updateRootLayerContents):
(WebView::nextDisplayIsSynchronous):
* WebView.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58423 268f45cc-cd09-0410-ab3c-d52691b4dbfc