Re-land: Finish implementation of automation API hit testing for the desktop

Re-land: Finish implementation of automation API hit testing for the desktop

Original change: r465716 https://codereview.chromium.org/2813083003/
Reverted: r465839 https://codereview.chromium.org/2827103003/
The original change failed due to "test produced excessive output".
Fixed by running final test callback only once.

This change finishes support for AX_ACTION_HIT_TEST in AXHostDelegate
so that you can send a hit test request on the root of the whole automation
tree and get a hit test on either views or web content.

Switches Select-to-speak to use this new API.  A follow-up change will
change the way select-to-speak works so that it sends the mouse event
to the extension and the hit test comes from there, but this is a
self-contained change that can land first.

BUG=699617
TBR=dtseng@chromium.org

Review-Url: https://codereview.chromium.org/2831853002
Cr-Commit-Position: refs/heads/master@{#465930}
Committed: https://chromium.googlesource.com/chromium/src/+/6c4193276b6a8a8ccbd75c1e514317a815f90e85

[dmazzoni, 2017-04-20 05:47:04]

The CQ bit was checked by dmazzoni@chromium.org

[commit-bot: I haz the power, 2017-04-20 05:47:25]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-20 07:02:35]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1492667224139010,
"parent_rev": "4abf1edcacd1ee11f84bcb6f63f14441b4f34107", "commit_rev":
"6c4193276b6a8a8ccbd75c1e514317a815f90e85"}

[commit-bot: I haz the power, 2017-04-20 07:02:48]

Description was changed from

==========
Re-land: Finish implementation of automation API hit testing for the desktop

Original change: r465716 https://codereview.chromium.org/2813083003/
Reverted: r465839 https://codereview.chromium.org/2827103003/
The original change failed due to "test produced excessive output".
Fixed by running final test callback only once.

This change finishes support for AX_ACTION_HIT_TEST in AXHostDelegate
so that you can send a hit test request on the root of the whole automation
tree and get a hit test on either views or web content.

Switches Select-to-speak to use this new API.  A follow-up change will
change the way select-to-speak works so that it sends the mouse event
to the extension and the hit test comes from there, but this is a
self-contained change that can land first.

BUG=699617
TBR=dtseng@chromium.org
==========

to

==========
Re-land: Finish implementation of automation API hit testing for the desktop

Original change: r465716 https://codereview.chromium.org/2813083003/
Reverted: r465839 https://codereview.chromium.org/2827103003/
The original change failed due to "test produced excessive output".
Fixed by running final test callback only once.

This change finishes support for AX_ACTION_HIT_TEST in AXHostDelegate
so that you can send a hit test request on the root of the whole automation
tree and get a hit test on either views or web content.

Switches Select-to-speak to use this new API.  A follow-up change will
change the way select-to-speak works so that it sends the mouse event
to the extension and the hit test comes from there, but this is a
self-contained change that can land first.

BUG=699617
TBR=dtseng@chromium.org

Review-Url: https://codereview.chromium.org/2831853002
Cr-Commit-Position: refs/heads/master@{#465930}
Committed:
https://chromium.googlesource.com/chromium/src/+/6c4193276b6a8a8ccbd75c1e5143...
==========

[commit-bot: I haz the power, 2017-04-20 07:02:50]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/6c4193276b6a8a8ccbd75c1e5143...