Add Search+Shift+H as global shortcut to toggle high contrast mode.

Add Search+Shift+H as global shortcut to toggle high contrast mode.

Originally we landed Ctrl+Alt+H as the shortcut, but this was reverted as
it conflicted with too many apps, and we didn't want it to be overridable.
We're going to migrate all accessibility toggles to Search+Shift+Letter.

This change also adds a notification to aid users who press it by accident.

BUG=644758
Committed: https://crrev.com/ac88b53fda73316cf2021fc18afbb4e496a4d9c9
Cr-Commit-Position: refs/heads/master@{#431897}

[dmazzoni, 2016-11-08 00:19:07]

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

[dmazzoni, 2016-11-08 00:19:07]

Hi Jenny, could you review ash/common/system and
the notification code before I get an owners review?

[dmazzoni, 2016-11-08 00:19:12]

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

[commit-bot: I haz the power, 2016-11-08 00:19:56]

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, 2016-11-08 00:50:07]

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

[commit-bot: I haz the power, 2016-11-08 00:50:08]

Dry run: This issue passed the CQ dry run.

[jennyz, 2016-11-10 21:42:09]

lgtm

[dmazzoni, 2016-11-10 22:07:49]

+jamescook for owners review of ash/

[dmazzoni, 2016-11-14 16:03:32]

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

[dmazzoni, 2016-11-14 16:03:33]

Oops, actually adding James

[James Cook, 2016-11-14 17:06:40]

LGTM

[dmazzoni, 2016-11-14 17:15:26]

The CQ bit was checked by dmazzoni@chromium.org

[commit-bot: I haz the power, 2016-11-14 17:15:51]

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, 2016-11-14 19:21:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-14 20:09:54]

Description was changed from

==========
Add Search+Shift+H as global shortcut to toggle high contrast mode.

Originally we landed Ctrl+Alt+H as the shortcut, but this was reverted as
it conflicted with too many apps, and we didn't want it to be overridable.
We're going to migrate all accessibility toggles to Search+Shift+Letter.

This change also adds a notification to aid users who press it by accident.

BUG=644758
==========

to

==========
Add Search+Shift+H as global shortcut to toggle high contrast mode.

Originally we landed Ctrl+Alt+H as the shortcut, but this was reverted as
it conflicted with too many apps, and we didn't want it to be overridable.
We're going to migrate all accessibility toggles to Search+Shift+Letter.

This change also adds a notification to aid users who press it by accident.

BUG=644758

Committed: https://crrev.com/ac88b53fda73316cf2021fc18afbb4e496a4d9c9
Cr-Commit-Position: refs/heads/master@{#431897}
==========

[commit-bot: I haz the power, 2016-11-14 20:09:55]

Patchset 1 (id:??) landed as
https://crrev.com/ac88b53fda73316cf2021fc18afbb4e496a4d9c9
Cr-Commit-Position: refs/heads/master@{#431897}