GitLab

Follow up on
https://chromium-review.googlesource.com/c/chromium/src/+/2470525 by
moving the remaining fullscreen tests to
PictureInPictureContentBrowserTest. The focus is on the video element
state transitions rather than the PiP UI.

This also improves testing stability: Even though these tests are not
marked as flaky, they do fail from time to time when run locally.

Last but not least, fullscreen as implemented in Content Shell is less
obtrusive than Chrome's full-fledged fullscreen when running tests, so
this improves the developer's experience.

Bug: 1138168
Change-Id: I51adf3541f8a8ab74ac0f7259e29efaa024b14ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511252
Commit-Queue: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825323}