mash: Migrate SessionStateDelegate interface to wm common types

mash: Migrate SessionStateDelegate interface to wm common types

Not much changed here, as the only interesting implementation is in chrome.

BUG=615155
TEST=existing ash_unittests and chrome unit_tests

Committed: https://crrev.com/26db34d5889988990938d46d99a02859481ad539
Cr-Commit-Position: refs/heads/master@{#398349}

[James Cook, 2016-06-07 16:32:26]

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

[James Cook, 2016-06-07 16:32:27]

sky, please take a look.

I decided to move this over in a separate CL so the other delegate-move one can
become a pure file move. (And thanks for catching this usage of aura::Window.)

[James Cook, 2016-06-07 17:11:29]

Actually, hold off, there's one more thing I want to convert.

[James Cook, 2016-06-07 17:27:22]

sky, please take a look.

Actually, I'm going to need to do the moves in multiple steps:
* This CL
* Move session state stuff to //ash/common, add
WmShell::GetSessionStateDelegate(), and touch up some delegate usage
* Move the other delegates

[sky, 2016-06-07 17:42:32]

LGTM

[James Cook, 2016-06-07 18:20:24]

The CQ bit was checked by jamescook@chromium.org

[commit-bot: I haz the power, 2016-06-07 18:20:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2042333002/20001

[commit-bot: I haz the power, 2016-06-07 18:25:56]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-07 18:27:34]

Description was changed from

==========
mash: Migrate SessionStateDelegate interface to wm common types

Not much changed here, as the only interesting implementation is in chrome.

BUG=615155
TEST=existing ash_unittests and chrome unit_tests
==========

to

==========
mash: Migrate SessionStateDelegate interface to wm common types

Not much changed here, as the only interesting implementation is in chrome.

BUG=615155
TEST=existing ash_unittests and chrome unit_tests

Committed: https://crrev.com/26db34d5889988990938d46d99a02859481ad539
Cr-Commit-Position: refs/heads/master@{#398349}
==========

[commit-bot: I haz the power, 2016-06-07 18:27:35]

Patchset 2 (id:??) landed as
https://crrev.com/26db34d5889988990938d46d99a02859481ad539
Cr-Commit-Position: refs/heads/master@{#398349}