Makes windowserver not send messages during shutdown

Makes windowserver not send messages during shutdown

To send messages during shutdown means clients may process messages in
weird order. The windowserver should not send any messages during
shutdown. The client can detect connection loss and take whatever
action is appropriate.

It may be we want a specific message to indicate the windowserver is going
down normally vs a crash, but for now I'm only making it so no
messages are sent.

BUG=648435
TEST=covered by test
R=sadrul@chromium.org

Committed: https://crrev.com/20e6c7ecccbcd292abc95fe906bd987cf9cb2bf2
Cr-Commit-Position: refs/heads/master@{#419670}

[sadrul, 2016-09-20 01:53:35]

Yeah, I think we are going to need a specific message at some point (especially
when we have mus:gpu and the clients would normally want to always re-establish
a lost connection to mus:gpu, since mus:gpu can crash and restart) lgtm

[sky, 2016-09-20 02:54:04]

The CQ bit was checked by sky@chromium.org

[sky, 2016-09-20 02:54:05]

The patchset sent to the CQ was uploaded after l-g-t-m from sadrul@chromium.org
Link to the patchset: https://codereview.chromium.org/2352893002/#ps40001
(title: "merge")

[commit-bot: I haz the power, 2016-09-20 02:54:24]

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, 2016-09-20 03:43:45]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-09-20 03:46:13]

Description was changed from

==========
Makes windowserver not send messages during shutdown

To send messages during shutdown means clients may process messages in
weird order. The windowserver should not send any messages during
shutdown. The client can detect connection loss and take whatever
action is appropriate.

It may be we want a specific message to indicate the windowserver is going
down normally vs a crash, but for now I'm only making it so no
messages are sent.

BUG=648435
TEST=covered by test
R=sadrul@chromium.org
==========

to

==========
Makes windowserver not send messages during shutdown

To send messages during shutdown means clients may process messages in
weird order. The windowserver should not send any messages during
shutdown. The client can detect connection loss and take whatever
action is appropriate.

It may be we want a specific message to indicate the windowserver is going
down normally vs a crash, but for now I'm only making it so no
messages are sent.

BUG=648435
TEST=covered by test
R=sadrul@chromium.org

Committed: https://crrev.com/20e6c7ecccbcd292abc95fe906bd987cf9cb2bf2
Cr-Commit-Position: refs/heads/master@{#419670}
==========

[commit-bot: I haz the power, 2016-09-20 03:46:14]

Patchset 3 (id:??) landed as
https://crrev.com/20e6c7ecccbcd292abc95fe906bd987cf9cb2bf2
Cr-Commit-Position: refs/heads/master@{#419670}