Automatic update from web-platform-tests [Scroll Timeline] Clamp overlapping offsets. Updated procedure that computes scroll timeline progress to accommodate for overlapping offsets. The update is to find last matching interval in the list of offsets. This is analogous to CSS property overrides where last specified property is applied. Bug: 1094014 Change-Id: I7d5c84e58bfea021f931b702d66a87d2d28aaf6c Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508356 Commit-Queue: Olga Gerchikov <gerchiko@microsoft.com> Reviewed-by: Kevin Ellis <kevers@chromium.org> Reviewed-by: Robert Flack <flackr@chromium.org> Cr-Commit-Position: refs/heads/master@{#842367} -- wpt-commits: d65368064231c91a35badbf306b1664a5fbad16e wpt-pr: 26869