Expand translate CSS parsing fast path

This CL expands the translate fast path in the CSS parser to cover many more
cases. Previously, if your translate contained more than 32 characters or more
than one translate function, we fell off the fast path.

Time attributed to v8.callFunction per frame on transform-benchmark.html:

Before:
- 5.644 ms

After:
- 2.881 ms

R=esprehn@chromium.org
BUG=330088

Review URL: https://codereview.chromium.org/119923003

git-svn-id: svn://svn.chromium.org/blink/trunk@164256 bbb929c8-8fbe-4397-9dbb-9b2b20218538