Add a test updating scroll position mid-smooth-scroll
This is a minimized test of https://crbug.com/376097633 on
boostmobile.com.
Bug: 376097633
Change-Id: I014d2a1b276f8047272f2a1bf587233844574951
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6001172
Commit-Queue: Philip Rogers pdr@chromium.org
Commit-Queue: Xianzhu Wang wangxianzhu@chromium.org
Reviewed-by: Xianzhu Wang wangxianzhu@chromium.org
Auto-Submit: Philip Rogers pdr@chromium.org
Cr-Commit-Position: refs/heads/main@{#1379136}