mash: Move WmShelfAura ownership to RootWindowController and init it earlier

mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests

Committed: https://crrev.com/be6ed82face2a9d329cd9f6309266958a3948b3f
Cr-Commit-Position: refs/heads/master@{#398105}

[James Cook, 2016-06-06 17:33:50]

Description was changed from

==========
WIP: Move WmShelfAura ownership to RootWindowController

BUG=
==========

to

==========
mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests
==========

[James Cook, 2016-06-06 17:34:58]

Description was changed from

==========
mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests
==========

to

==========
mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests
==========

[James Cook, 2016-06-06 17:42:49]

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

[James Cook, 2016-06-06 17:42:50]

sky, please take a look.

I'm planning to continue using WmShelf as the "public interface" to the shelf as
I port code into ash/common/shelf and ash/common/system/tray.

[sky, 2016-06-06 19:02:44]

LGTM

[James Cook, 2016-06-06 20:01:54]

The CQ bit was checked by jamescook@chromium.org

[commit-bot: I haz the power, 2016-06-06 20:03:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2041583004/20001

[commit-bot: I haz the power, 2016-06-06 20:09:06]

Description was changed from

==========
mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests
==========

to

==========
mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests
==========

[commit-bot: I haz the power, 2016-06-06 20:09:07]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-06 20:10:53]

Description was changed from

==========
mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests
==========

to

==========
mash: Move WmShelfAura ownership to RootWindowController and init it earlier

This will allow it to be used in status tray initialization code. In particular:
* It can wrap actions handled by ShelfWidget and ShelfLayoutManager
(e.g. GetAutoHideState)
* It can have observers similar to ShelfLayoutManagerObserver
(OnAutoHideStateChanged)

It's also more similar to how ash::mus::RootWindowController owns WmShelfMus.

BUG=615155
TEST=ash_unittests

Committed: https://crrev.com/be6ed82face2a9d329cd9f6309266958a3948b3f
Cr-Commit-Position: refs/heads/master@{#398105}
==========

[commit-bot: I haz the power, 2016-06-06 20:10:55]

Patchset 2 (id:??) landed as
https://crrev.com/be6ed82face2a9d329cd9f6309266958a3948b3f
Cr-Commit-Position: refs/heads/master@{#398105}