Reviewed by Adam Roben.

Reviewed by Adam Roben.

Fixes: http://bugs.webkit.org/show_bug.cgi?id=15393
Fix problems with hidden glyphs. They were taken into account for quite
some operations (hit testing, length calulcations etc..) except painting.
Especially fixes boundaries of <textPath> (see using Web Inspector) if
text-anchor isn't equal to 'start'.

Added testcase:
svg/text/textPathBoundsBug.svg

Fixed testcase: (all showed text selection problems on text paths)
svg/batik/text/textGlyphOrientationHorizontal.svg
svg/batik/text/textOnPath.svg
svg/batik/text/textOnPath3.svg
svg/batik/text/verticalTextOnPath.svg
svg/text/text-align-04-b.svg
svg/W3C-SVG-1.1/text-align-04-b.svg

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@28015 268f45cc-cd09-0410-ab3c-d52691b4dbfc