Fix issue with descendants of aria-activedescendant being marked as focusable.

Fix issue with descendants of aria-activedescendant being marked as focusable.

The ARIA spec says that descendants of a node with aria-activedescendant set should
be marked as focusable if they have an ARIA role. But this doesn't make sense if the
ARIA role is "none" or "presentation", so fix that. Also ensure that we recompute
cached attributes whenever aria-activedescendant changes, even if it doesn't point to
a valid ID, because it can affect focusability.

BUG=651127
Committed: https://crrev.com/6940f7313fe70eb077836a6bdaa8502ffb256ad1
Cr-Commit-Position: refs/heads/master@{#422164}

[dmazzoni, 2016-09-30 16:49:58]

The CQ bit was checked by dmazzoni@chromium.org to run a CQ dry run

[dmazzoni, 2016-09-30 16:50:02]

dmazzoni@chromium.org changed reviewers:
+ aboxhall@chromium.org

[commit-bot: I haz the power, 2016-09-30 16:50:24]

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

[aboxhall, 2016-09-30 17:04:13]

lgtm

[commit-bot: I haz the power, 2016-09-30 18:18:58]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-30 18:18:58]

Dry run: This issue passed the CQ dry run.

[dmazzoni, 2016-09-30 18:40:05]

The CQ bit was checked by dmazzoni@chromium.org

[commit-bot: I haz the power, 2016-09-30 18:40:49]

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, 2016-09-30 18:48:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-30 18:52:25]

Description was changed from

==========
Fix issue with descendants of aria-activedescendant being marked as focusable.

The ARIA spec says that descendants of a node with aria-activedescendant set
should
be marked as focusable if they have an ARIA role. But this doesn't make sense if
the
ARIA role is "none" or "presentation", so fix that. Also ensure that we
recompute
cached attributes whenever aria-activedescendant changes, even if it doesn't
point to
a valid ID, because it can affect focusability.

BUG=651127
==========

to

==========
Fix issue with descendants of aria-activedescendant being marked as focusable.

The ARIA spec says that descendants of a node with aria-activedescendant set
should
be marked as focusable if they have an ARIA role. But this doesn't make sense if
the
ARIA role is "none" or "presentation", so fix that. Also ensure that we
recompute
cached attributes whenever aria-activedescendant changes, even if it doesn't
point to
a valid ID, because it can affect focusability.

BUG=651127

Committed: https://crrev.com/6940f7313fe70eb077836a6bdaa8502ffb256ad1
Cr-Commit-Position: refs/heads/master@{#422164}
==========

[commit-bot: I haz the power, 2016-09-30 18:52:26]

Patchset 1 (id:??) landed as
https://crrev.com/6940f7313fe70eb077836a6bdaa8502ffb256ad1
Cr-Commit-Position: refs/heads/master@{#422164}