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This test incorrectly allows overscroll actions like gesture-navigation
which would interfere with the reported overscroll delta. This CL
disables overscroll actions with |overscroll-behavior:none|; however,
Chrome has a bug where it consumes overscroll delta, even when
overscroll-behavior is set to none.

Because of this bug, this test uses very approximate values for
expectations and were right on the edge of what was frequently being
seen. However, due to the nature of the bug a timing change here nudged
it below the thresholds so I've loosened these.

Bug: 1112183
Change-Id: If4ecf7a263385ddc3211f7776aca21eb8ec3aa95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442152Reviewed-by: Liviu Tinta <liviutinta@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813770}