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This CL fixes RenderAccessibilityImpl::OnHitTest for OOPIFs by
having the point under hit testing transform if it's going to be
passed to an OOPIF. While the transformation used in this CL isn't
fully general, it will fix the majority of cases.

Bug: 977381
Change-Id: Ie2f3bfb9334c6f4a3f38680f2b8de887620fe26c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1687562Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675639}