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On touch adjustment, we do a point-base hit test after the rect-base one
to make sure we find the correct target. This cl changes the point-base
hit test from the iframe to the root frame. Because when we have iframe
overlap by other elements, rect-base hit test might result an incorrect
target in the iframe. In-frame hit-test cannot find the correct target
that is outside the iframe. So, we should do the point-base hit-test on
root-frame to find the correct target.

Bug: 864849
Change-Id: Ib176a68e5c51eba40c504ad90190bec7fb66dccb
Reviewed-on: https://chromium-review.googlesource.com/1145477Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577946}