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When doing recursive hit testing and the point falls within two children
of the same element, prefer the one that has an indirect descendant
(i.e. grandchild) match.

A better fix would be to send an IPC to the renderer and let Blink do
the hit testing, I filed another bug (357371) for that. This is a stopgap.

Note, though, that we still need this hit testing algorithm for
synchronous APIs (like on Windows), so it's worth improving this.

BUG=357247
R=aboxhall@chromium.org

Review URL: https://codereview.chromium.org/215633003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260161 0039d316-1c4b-4281-b951-d872f2087c98