Add hittest mode for Touch-action which ignore inline elements and svg elements

Intoducing new HitTestRequest::TouchAction hit test type, which will be used
in Special hit testing for computing effective touch-action in eventhandler.

BUG=247396, 319479

Review URL: https://codereview.chromium.org/137123009

git-svn-id: svn://svn.chromium.org/blink/trunk@168443 bbb929c8-8fbe-4397-9dbb-9b2b20218538