add 'manipulation' support to CSS touch-action parsing.
'manipulation' is added in latest editors draft
https://dvcs.w3.org/hg/pointerevents/raw-file/tip/pointerEvents.html#the-touch-action-css-property

BUG=349016

Review URL: https://codereview.chromium.org/134153016

git-svn-id: svn://svn.chromium.org/blink/trunk@168752 bbb929c8-8fbe-4397-9dbb-9b2b20218538