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Hit test coordinates from the a11y-manager are relative to the
registered view's coordinate space. When pixel scaling is on, this
coordinate space is scaled to be a device-independent space. However,
Chromium's semantic trees are scaled to the device resolution. This
patch adds scaling of the received coordinates to compensate for this
difference.

Note that with this patch, Fuchsia highlights are still quite broken.
There is likely some degree of scaling issue there, but the more
major problem is fuchsia:62891.

Fixed: fuchsia:59633
Change-Id: I1e4217592a48fe284a60b5edb294c21b855744a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508322
Commit-Queue: Tess Eisenberger <teisenbe@google.com>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Auto-Submit: Tess Eisenberger <teisenbe@google.com>
Cr-Commit-Position: refs/heads/master@{#826637}