1490474 - [wpt-sync] Sync PR 12955 - [IntersectionObserver] Fix over-invalidations in LocalFrameView

Status: NEW

(Testing :: web-platform-tests, enhancement, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 12955 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/12955
Details from upstream follow.

Stefan Zager <[e-mail]> wrote:
>  [IntersectionObserver] Fix over-invalidations in LocalFrameView
>  
>  Prior to this patch, any call to SetNeedsIntersectionObservation would
>  cause all IntersectionObservers in all documents in the frame tree to
>  be marked as needing an update, even when they were not actually dirty.
>  This patch avoids propagating the dirty bit all the way up the frame
>  tree, so that each IntersectionObservation runs only when necessary.
>  
>  BUG=879798
>  R=[e-mail]
>  
>  Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
>  Change-Id: I6a5e7b3b966441aca9193a97026ca89c66e039b1
>  Reviewed-on: https://chromium-review.googlesource.com/1212449
>  WPT-Export-Revision: 0833fd145b7f77d1e21fc9cd1728e146ab6d8d39

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try https://treeherder.mozilla.org/#/jobs?repo=try&revision=42fc6f5721969f4108e400958da705229e6ddb48

Comment 2

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=e44b62c18642c95c3f948c33e1e79fdc30fa949e