Fix crash during shutdown

Fix crash during shutdown
* keep alive has to be incremented at startup.
* exclude more code that depends on ash.
* create a screen for shutdown

Minor cleanup
* remove all containers when ScreenManager is deleted.

BUG=397167, 401044
TEST=AthenaShutdownTest.Shutdown

Committed: https://crrev.com/13ba9b2b46c0977d30fad57d96da1772c0cf67f1
Cr-Commit-Position: refs/heads/master@{#294083}

[oshima, 2014-09-09 22:04:55]

Patchset #3 (id:40001) has been deleted

[oshima, 2014-09-09 22:04:58]

Patchset #1 (id:1) has been deleted

[oshima, 2014-09-09 22:05:03]

Patchset #1 (id:20001) has been deleted

[oshima, 2014-09-09 22:06:06]

oshima@chromium.org changed reviewers:
+ sadrul@chromium.org

[sadrul, 2014-09-09 23:27:45]

https://codereview.chromium.org/558823002/diff/60001/athena/env/athena_env_im...
File athena/env/athena_env_impl.cc (right):

https://codereview.chromium.org/558823002/diff/60001/athena/env/athena_env_im...
athena/env/athena_env_impl.cc:40: class ScreenForShutdown : public gfx::Screen {
Any chance this could be consolidated with the ash version? (it feels
unfortunate that we need this at all)

https://codereview.chromium.org/558823002/diff/60001/athena/env/athena_env_im...
athena/env/athena_env_impl.cc:292: 
This doesn't seem to be used?

[oshima, 2014-09-09 23:52:46]

https://codereview.chromium.org/558823002/diff/60001/athena/env/athena_env_im...
File athena/env/athena_env_impl.cc (right):

https://codereview.chromium.org/558823002/diff/60001/athena/env/athena_env_im...
athena/env/athena_env_impl.cc:40: class ScreenForShutdown : public gfx::Screen {
On 2014/09/09 23:27:44, sadrul wrote:
> Any chance this could be consolidated with the ash version? (it feels
> unfortunate that we need this at all)

That'll be done when we switch the display code to use display manager. Added
TODO with bug #.

https://codereview.chromium.org/558823002/diff/60001/athena/env/athena_env_im...
athena/env/athena_env_impl.cc:292: 
On 2014/09/09 23:27:44, sadrul wrote:
> This doesn't seem to be used?

Oops, forgot to cleanup. Removed.

[sadrul, 2014-09-10 00:01:05]

lgtm

[oshima, 2014-09-10 00:59:35]

The CQ bit was checked by oshima@chromium.org

[commit-bot: I haz the power, 2014-09-10 01:09:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/oshima@chromium.org/558823002/80001

[commit-bot: I haz the power, 2014-09-10 02:50:24]

Committed patchset #2 (id:80001) as 4bb8b50b8100f63af878b9e3b577418a50e933e2

[commit-bot: I haz the power, 2014-09-10 03:58:32]

Patchset 2 (id:??) landed as
https://crrev.com/13ba9b2b46c0977d30fad57d96da1772c0cf67f1
Cr-Commit-Position: refs/heads/master@{#294083}