Merge test for WebKit crash when mutating SVG text with transform

This patch merges a test from https://trac.webkit.org/r161630 by Antti
Koivisto <antti@apple.com>.

BUG=333311

Review URL: https://codereview.chromium.org/134423002

git-svn-id: svn://svn.chromium.org/blink/trunk@164905 bbb929c8-8fbe-4397-9dbb-9b2b20218538