Revert of Reland "Implement FullScreen using top layer." (patchset #13 id:260001 of https://codereview.chromium.org/2107233002/ )
Reason for revert:
Multiple regressions around the fullscreen transition becoming visibly
worse, as well as a suspected leak.
BUG=628554,628605,628662,630191
Original issue's description:
> Reland "Implement FullScreen using top layer."
>
> This reverts commit 2460a95281959d1b4dd941fed10998adf8dcb63c.
>
> Notable changes on top of previous attempt:
>
> full-screen-iframe-ua-style.html is changed to use overflow property
> instead, as position is no longer changed on ancestors.
>
> :root:-webkit-full-screen-ancestor { overflow: hidden !important; } is
> retained, as the previous attempt regressed on Vimeo (crbug.com/543946)
> and it's not clear yet how to handle this in the spec:
> https://github.com/whatwg/fullscreen/issues/19
>
> Make ::backdrop work for replaced content (video, iframe, etc.) by
> changing StyleResolver::createPseudoElementIfNeeded to allow creating
> the ::backdrop pseudo-element even if the parent doesn't support
> children. With this change, full-screen-stacking-context.html was
> simplified and full-screen-video-has-backdrop.html was
> simplified+renamed.
>
> The will-change override is dropped, as full-screen-will-change.html
> passes without it.
>
> BUG=240576, 543946
>
> Committed: https://crrev.com/d666f503ae854fac360cc70da1f5971a6724546a
> Cr-Commit-Position: refs/heads/master@{#405478}
TBR=dsinclair@chromium.org,esprehn@chromium.org,eae@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=240576, 543946
Review-Url: https://codereview.chromium.org/2168373002
Cr-Commit-Position: refs/heads/master@{#407089}
53 files changed
