tree ac326789c73f77815f53498f35b38cc6ed6e8e4c
parent 2c4d3746975998c5e0fd3ca8fd33f7dc23cb4bd2
author Kevin Ellis <kevers@chromium.org> 1637959661 -0800
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1637960428 -0800

Add scroll smoothness check to scroll-snap test with keyboard input

Previous the test only ensure that we reached the expected endpoint,
but the transition could be smooth or a sudden jump. With the patch, we
count the number of steps before reaching the endpoint. During
experimental testing, hundreds of scroll events were received during the
course of a smooth scroll.  The required target was set to 2, to catch
an immediate jump and to non-flake when a testing machine is bogged
down.

Bug: 1273921
Change-Id: Ie24a5fa2795af3860fe38bdd93522dde2f39365b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3302851
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Kevin Ellis <kevers@chromium.org>
Cr-Commit-Position: refs/heads/main@{#945701}