commit f37c197117dac5e465250f159e1969da26f37ed4
author Dominic Mazzoni <dmazzoni@chromium.org> Wed Sep 27 17:53:44 2017
committer Commit Bot <commit-bot@chromium.org> Wed Sep 27 17:53:44 2017
tree 81ffa70e38ce3a1bf9592734f99695edc8aa3083
parent a59fb76dee9cb53c74ddb4fe82dffe0335ea827b

Split the accessible combo box role into three roles.

For historical reasons, the ARIA role "combobox" is misused
and misunderstood. It can be one of three things:

1. A fully editable text field that also has a drop-down list
   of possible options
2. A button that opens to reveal a mutually-exclusive list of
   choices (but with no text field anywhere)
3. A grouping container with a text field and a drop-down list
   inside

The only platform where this mostly worked was on Windows,
where "combo box" is a native control. On Mac and Android,
we need to treat #1 as a text field primarily, and #2 more
like a button, since there's no equivalent that acts as
both.

Bug: 516869, 666049, 546051
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I7ffd92f2996c729398d4300262e545eaa9ca0009
Reviewed-on: https://chromium-review.googlesource.com/642056
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504725}