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Unfortunately a ton of refactoring was required to make this
possible, because too much of logic assumed the existence of
an Element, and assumed that we only cared about ARIA on
AXNodeObject subclasses.

I stopped after supporting just 3 properties because this is
a large enough change already.

Bug: 761901
Change-Id: Ie7148f3d4aaf3308d43089260b761f73e56d995b
Reviewed-on: https://chromium-review.googlesource.com/676879Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503603}