Implement UIA accessibility tree formatter

Currently only dumps UIA properties.
Split AddDefaultFilters by platform.

Implemented VersionSpecificExpectedFileSuffix to allow us to
test win7 against its own expected file when it would
differ from other versions, while avoiding duplicate
win7-uia-expected and win-uia-expected in cases where they
would be the same.

Added some -uia-win-expected.txt files.
Added some -uia-win7-expected.txt files.

Bug: 844149
Change-Id: I81be087904b640ad86caf5d22c683bfd31889f90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1499701
Commit-Queue: Jacques Newman <janewman@microsoft.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638874}
35 files changed