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This CL follows the pattern of:
https://chromium-review.googlesource.com/c/chromium/src/+/1715906

That is, in order to change the viewport style propagation logic
for overscroll behavior, we want to add use counters to understand
the potential breakage.

Bug: 954423
Change-Id: I410aa665873167ffe523911a823e9b47cd117018
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560396
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831204}