[CSS Shapes] Add performance tests for SVG shape with shape-margin

Test taken from https://bugs.webkit.org/show_bug.cgi?id=129930

BUG=349093
NOTRY=true

Review URL: https://codereview.chromium.org/195633002

git-svn-id: svn://svn.chromium.org/blink/trunk@168939 bbb929c8-8fbe-4397-9dbb-9b2b20218538