Restrict touch to the view height with the title. This

should fix the links in the bottom of the screen are not
touchable when title bar presents.

Also fix a bug in calcOutContentVisibleRect. We need to
adjust visibleTitleHeight for the top, but we should not
do it for the bottom. Otherwise, WebKit will have the
wrong visible rect and it will think the part right under
the bottom of the screen are visible.

Fix http://b/issue?id=2140971