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A previous change ensured that large custom cursors > 32x32
would be dropped if they are not fully contained with the visual
viewport. However, the computation did not account properly for OOPIFs,
where cursor coordinates were not adjusted to the viewport offset.
This CL further adjusts the cursor rect by translating it to the root
view's coordinate space via LocalToAncestorPoint, before
checking for containment within the visual viewport.

Bug: 1099276
Change-Id: I0a03e7cc249cd785f9e76f931cfc7931b127d56b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2278597
Auto-Submit: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790122}