Add support for a preference in WebKit that can be used in nightly builds to test full page
        zoom.

        Reviewed by Antti

        * WebView/WebPreferenceKeysPrivate.h:
        * WebView/WebView.mm:
        (-[WebView setTextSizeMultiplier:]):
        (-[WebView canMakeTextSmaller]):
        (-[WebView makeTextSmaller:]):
        (-[WebView canMakeTextLarger]):
        (-[WebView makeTextLarger:]):
        (-[WebView canMakeTextStandardSize]):
        (-[WebView makeTextStandardSize:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31134 268f45cc-cd09-0410-ab3c-d52691b4dbfc