GitLab

Adding unitests to ensures the zero width characters are processeed
correctly with render_text and font fallbacks.

R=msw@chromium.org

Bug: 972090
Change-Id: Ie68f706278669f1347475699cf0516e9ad1356ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1681451Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673430}