[Home] Add some accessibility support

[Home] Add some accessibility support

 * Announce when the panel is opened and closed.
 * Prevent focus from going to the tab content when the bottom
   sheet is open.
 * Change the in-product help bubble when the expand button is
   enabled and use different strings for non-accessibility mode
   and accessibility mode.
 * Announce when a different bottom sheet tab is selected.
 * When the expand button isn't visible, make the entire toolbar
   focusable for accessibility and add a content description.

BUG=724694, 724696, 724693, 724695
Review-Url: https://codereview.chromium.org/2895223003
Cr-Commit-Position: refs/heads/master@{#473995}
Committed: https://chromium.googlesource.com/chromium/src/+/44dd1fe909c433cf0b8297be8825e372fc2d57a8

[Theresa, 2017-05-23 00:36:01]

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

[commit-bot: I haz the power, 2017-05-23 00:36:41]

Dry run: CQ is trying da patch.

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

[Theresa, 2017-05-23 00:38:00]

twellington@chromium.org changed reviewers:
+ mdjones@chromium.org

[Theresa, 2017-05-23 00:38:01]

ptal

[commit-bot: I haz the power, 2017-05-23 01:29:54]

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

[commit-bot: I haz the power, 2017-05-23 01:29:55]

Dry run: This issue passed the CQ dry run.

[Theresa, 2017-05-23 15:53:46]

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

[Theresa, 2017-05-23 15:54:28]

Description was changed from

==========
[Home] Add some accessibility support

 * Announce when the panel is opened and closed.
 * Prevent focus from going to the tab content when the bottom
   sheet is open.
 * Change the in-product help bubble when the expand button is
   enabled and use different strings for non-accessibility mode
   and accessibility mode.
 * Announce when a different bottom sheet tab is selected.

BUG=724694,724696,724693
==========

to

==========
[Home] Add some accessibility support

 * Announce when the panel is opened and closed.
 * Prevent focus from going to the tab content when the bottom
   sheet is open.
 * Change the in-product help bubble when the expand button is
   enabled and use different strings for non-accessibility mode
   and accessibility mode.
 * Announce when a different bottom sheet tab is selected.
 * When the expand button isn't visible, make the entire toolbar
   focusable for accessibility and add a content description.

BUG=724694,724696,724693,724695
==========

[commit-bot: I haz the power, 2017-05-23 15:54:32]

Dry run: 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, 2017-05-23 16:44:37]

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

[commit-bot: I haz the power, 2017-05-23 16:44:38]

Dry run: This issue passed the CQ dry run.

[mdjones, 2017-05-23 17:25:48]

lgtm

[Theresa, 2017-05-23 18:00:00]

twellington@chromium.org changed reviewers:
+ tedchoc@chromium.org

[Theresa, 2017-05-23 18:00:01]

+tedchoc@ for OWNERS

[Ted C, 2017-05-23 18:27:32]

lgtm

[Theresa, 2017-05-23 18:29:08]

The CQ bit was checked by twellington@chromium.org

[commit-bot: I haz the power, 2017-05-23 18:29:41]

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, 2017-05-23 18:36:20]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1495564148465330,
"parent_rev": "471379a5598eea23b5514740f17ce66b4a76bb68", "commit_rev":
"44dd1fe909c433cf0b8297be8825e372fc2d57a8"}

[commit-bot: I haz the power, 2017-05-23 18:36:36]

Description was changed from

==========
[Home] Add some accessibility support

 * Announce when the panel is opened and closed.
 * Prevent focus from going to the tab content when the bottom
   sheet is open.
 * Change the in-product help bubble when the expand button is
   enabled and use different strings for non-accessibility mode
   and accessibility mode.
 * Announce when a different bottom sheet tab is selected.
 * When the expand button isn't visible, make the entire toolbar
   focusable for accessibility and add a content description.

BUG=724694,724696,724693,724695
==========

to

==========
[Home] Add some accessibility support

 * Announce when the panel is opened and closed.
 * Prevent focus from going to the tab content when the bottom
   sheet is open.
 * Change the in-product help bubble when the expand button is
   enabled and use different strings for non-accessibility mode
   and accessibility mode.
 * Announce when a different bottom sheet tab is selected.
 * When the expand button isn't visible, make the entire toolbar
   focusable for accessibility and add a content description.

BUG=724694,724696,724693,724695

Review-Url: https://codereview.chromium.org/2895223003
Cr-Commit-Position: refs/heads/master@{#473995}
Committed:
https://chromium.googlesource.com/chromium/src/+/44dd1fe909c433cf0b8297be8825...
==========

[commit-bot: I haz the power, 2017-05-23 18:36:37]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/44dd1fe909c433cf0b8297be8825...