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If more than one page was visible in the viewport, getPageAtY_(y) fell
through to returning 0 when y was the bottom of the document, because
in the last iteration of the loop, where max = min = page = N-1 (for an
N page document), the bottom of the page was exactly equal to y, rather
than strictly > y.

This resulted in the most visible page being set to N-1 rather than N
when the document was scrolled to the bottom in this case.

Bug: 1000121
Change-Id: I541204141d1fb7891f1df1bc95d00be28d39bbfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851086
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704717}