We need to add a fontSmoothingType property of type FontSmoothingType to WebView the same as there is on Text node so we can choose the style of font smoothing used by WebView and it is not hard coded. This is needed primarily so we can turn LCD font smoothing off on Mac as part of RT-19041.

This new property should be settable via CSS and it should be set to LCD by default in caspian.css the same as has been done for all UI Controls. This will then be changed back to Gray by RT-19041 on Mac until RT-19040 is fixed.