tree 6d22385a1ec2741e8d03f3f01eb377df06f0c561
parent 5805d1a8a3f313e547bf8c1a427aeba23f5cc85f
author Michal Mocny <mmocny@chromium.org> 1673984320 -0800
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1673985162 -0800

Ignore presentation time if visibility changed, for Event Timing

EventTiming registers for presentation feedback times for events which
are expected to have a visual update.  However, if page visibility
changes, that can affect the time it takes to present the next paint
update.

We were already ignoring the time to next paint portion for UKM
reporting of interactions, but now we also ignore this time for Event
Timing reporting to Web Performance timeline.

Filed a spec issue with EventTiming API to clarify cases where events
will not have a next paint:
https://github.com/w3c/event-timing/issues/123

Also, we will follow-up to see if it is not desirable to measure all the
way until visibility change, as per:
https://github.com/w3c/event-timing/issues/129

Bug: 1312568
Change-Id: Iee0b5eee81fb216a96ecbfcc41ca26601ab6ba1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3926369
Commit-Queue: Michal Mocny <mmocny@chromium.org>
Auto-Submit: Michal Mocny <mmocny@chromium.org>
Reviewed-by: Noam Rosenthal <nrosenthal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1093452}