GitLab

The BasicShape ellipse and circle functions now report a syntax error
if the "at" keyword is not followed by a position.

The existing parsing tests have been updated to include this case.

Ported over from http://trac.webkit.org/changeset/165835

BUG=353774

Review URL: https://codereview.chromium.org/203413006

git-svn-id: svn://svn.chromium.org/blink/trunk@169583 bbb929c8-8fbe-4397-9dbb-9b2b20218538