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Scenarios that we are interested in:
 - how often is the popup exceeding the owner window bounds
 - how often does the popup receive tap/mouse down/ mouse wheel events
outside the owner window bounds

This CL has no user visible behavior changes.

Bug: 1066241
Change-Id: I0f88e75b452a2c7490045b31f0b9e773314a2d50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2200425
Commit-Queue: Ionel Popescu <iopopesc@microsoft.com>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769035}