Expose fixed layout through WebKit SPI
-and corresponding-
<rdar://problem/8844464>

Reviewed by Anders Carlsson.

Source/WebCore: 

And now with getters!
* WebCore.exp.in:

WebKit/mac: 

And now with getters!
* WebView/WebView.mm:
(-[WebView _useFixedLayout]):
(-[WebView _fixedLayoutSize]):
* WebView/WebViewPrivate.h:

WebKit2: 

And now with getters!
* UIProcess/API/C/WKPage.cpp:
(WKPageUseFixedLayout):
(WKPageFixedLayoutSize):
* UIProcess/API/C/WKPage.h:
* UIProcess/WebPageProxy.h:
(WebKit::WebPageProxy::useFixedLayout):
(WebKit::WebPageProxy::fixedLayoutSize):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75662 268f45cc-cd09-0410-ab3c-d52691b4dbfc