Fast path for simple transform parsing

Fast path for simple transform parsing
https://bugs.webkit.org/show_bug.cgi?id=89898

Reviewed by Anders Carlsson.

When manipulating transforms using script, the transform value parsing can show up in profiles pretty heavily
(up 4% in some cases). We can optimize it easily by implementing a fast path that does not spin up the full CSS
parser, like we already do for several other common value types.

The patch implements a fast path for transform(), transformX/Y/Z() and transform3D(). It speeds up parsing by >5x.

* css/CSSParser.cpp:
(WebCore):
(WebCore::parseTransformArguments):
(WebCore::parseTransformValue):
(WebCore::CSSParser::parseValue):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121175 268f45cc-cd09-0410-ab3c-d52691b4dbfc