Add test for viewport units in SVG-in-<img> context

Bug: 650147
Change-Id: I4a158f600acb733477d33ebbd6a504490a5b54a4
Reviewed-on: https://chromium-review.googlesource.com/c/1341836
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609346}
2 files changed