[SVG2] Add support for marker orient="auto-start-reverse".

Spec: https://svgwg.org/svg2-draft/painting.html#OrientAttribute

BUG=367748

Review URL: https://codereview.chromium.org/539833004

git-svn-id: svn://svn.chromium.org/blink/trunk@181732 bbb929c8-8fbe-4397-9dbb-9b2b20218538