tree ca1cf881ea6d4fa683498e1e37e05ec9afffd724
parent 8ada79adac3c2febb71688ccc055e2f3eb78b7e8
author Aoyuan Zuo <zuoaoyuan@chromium.org> 1708035302 +0000
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1708035302 +0000

[Event Timing] Expose interactionId to Keypress & keydown/up under composition

This CL changes the logic of generating interaction Id for keyboard
events in performance event timing.

Non-composition:
* Previous behaviour: Interaction id is generated on keyups, and will
  match the related keydown backwards.
* New behaviour: Interaction id is now generated on the keydown entry,
  and match forward with related keypress and keyup.
Composition(IME, virtual keyboard, etc.):
* Previous behaviour: Interaction id is assigned to each input event
  only.
* New behaviour: Interaction id is generated on the first input or
  keydown event (whichever comes first) before the compositionupdate,
  and any further keydown or input event before the compositionupdate
  and any number of keyups after compositionupdate will be matched
  with same interaction id.

This may affect the total duration of INP since more events are now
being meatured, eg. keypress.

Low-Coverage-Reason: OTHER This CL is also covered by wpt manual test.
Bug: 1456384
Change-Id: Ie736f3f189e9a349badbe03c4a65627ac491eff4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4632521
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Aoyuan Zuo <zuoaoyuan@chromium.org>
Reviewed-by: Michal Mocny <mmocny@chromium.org>
Reviewed-by: Aoyuan Zuo <zuoaoyuan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1261339}