Ignore all RenderTest golden images

Ignores all "render_tests/*.png" files in git instead of explicitly
listing directories to ensure that any new RenderTest golden directories
that get added don't accidentally get committed without being ignored.

Bug: 930181
Change-Id: Iec0178f47fc6d2ca0948b6cd9697f3cdd29f0c8c
Reviewed-on: https://chromium-review.googlesource.com/c/1461319
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630474}
1 file changed