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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}