GitLab

Add virtual tests for default dark mode behavior for images. This will
help check and correct default behavior for images.

Bug: 1116914
Change-Id: Ifcd6db9df15b5616511fdc50125f277071341976
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434023Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#811931}