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Before this CL, we always treated endScrollOffset as inclusive, against
the spec. The spec was recently updated to treat endScrollOffset as
inclusive but only when it is equal to max-offset:
https://github.com/WICG/scroll-animations/pull/37

Bug: 934989
Change-Id: I7cd9cf4619e804a54cef33ef8d3ec7395166bace
Reviewed-on: https://chromium-review.googlesource.com/c/1483682
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636673}