GitLab

The test can end before the video's first frames are painted. This CL
attempts to fix the issue by making sure we have a frame per video
before ending.

Bug: 963141
Change-Id: Iccc9f771f4e7e366914b00b3a6004a08cf9829b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225372
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827015}