Deflake interrupt-hidden-smooth-scroll.html
This test can end at 200 if it is "interrupted" after already reaching
200. Change the logic to only consider mid-scroll changes as
interruptions.
Fixed: 377920940, 377909956
Change-Id: Iddc6b7810285e131fb5a6ea7409328af9f196d9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6013445
Auto-Submit: Philip Rogers pdr@chromium.org
Reviewed-by: Xianzhu Wang wangxianzhu@chromium.org
Commit-Queue: Xianzhu Wang wangxianzhu@chromium.org
Cr-Commit-Position: refs/heads/main@{#1390430}