commit 5b0b49d8fd5c30e5ae7c009234760c5bce759588
author rbpotter <rbpotter@chromium.org> Thu Jan 30 19:08:15 2025
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Jan 30 19:08:15 2025
tree baa1495457e7c427bac3b154bedfb4d919782af9
parent 66f77e0b368c1666385ac653edd1eeddd5e50d1b

cr-lazy-list: Add a chunking mode and use in chrome://extensions

- Add a "chunking mode" to cr-lazy-list, which sets content-visibility
  on chunks of `chunkSize` items instead of on the individual items
  themselves. "chunking mode" is enabled by setting the `chunkSize`
  property to a value > 1.
- Use the new  mode from the extensions activity log stream, which may
  have a very large number of relatively short (56px) items.
- Also adding a few validation tests for the new mode, to allow for
  easier experimentation and to confirm it is working as expected.

Observations:
- 20% improvement in scrolling from one end of the list to the other
  once all (300+) items in the list have rendered.
- More significant (50%+) improvement in speed of scrolling to the end
  of the list on initial render.

Bug: None
Change-Id: Ia5de8c9280545ca4f53a6e887174b9011afa75c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6153293
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1413623}