Don't restart the GPU process when switching to another TTY

Don't exit the GPU process if on a non-host TTY

Requests to the X11 server may be stalled if we switch away from the
TTY that is hosting the X server.  In this case, don't restart the GPU
process as it will become responsive again when we switch to its TTY.

BUG=355720
Committed: https://crrev.com/9db5a0e3f53edfa3cc653d9d6f8476c17bc7d2b9
Cr-Commit-Position: refs/heads/master@{#394957}

[Tom (Use chromium acct), 2016-05-19 21:39:16]

thomasanderson@google.com changed reviewers:
+ piman@chromium.org

[piman, 2016-05-19 21:43:38]

lgtm

[Tom (Use chromium acct), 2016-05-19 21:44:38]

The CQ bit was checked by thomasanderson@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-05-19 21:45:11]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1991353002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1991353002/20001

[commit-bot: I haz the power, 2016-05-19 23:44:10]

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

[commit-bot: I haz the power, 2016-05-19 23:44:11]

Dry run: Try jobs failed on following builders:
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Tom (Use chromium acct), 2016-05-20 01:37:01]

The CQ bit was checked by thomasanderson@google.com

[commit-bot: I haz the power, 2016-05-20 01:37:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1991353002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1991353002/20001

[commit-bot: I haz the power, 2016-05-20 01:57:27]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-05-20 01:58:41]

Description was changed from

==========
Don't exit the GPU process if on a non-host TTY

Requests to the X11 server may be stalled if we switch away from the
TTY that is hosting the X server.  In this case, don't restart the GPU
process as it will become responsive again when we switch to its TTY.

BUG=355720
==========

to

==========
Don't exit the GPU process if on a non-host TTY

Requests to the X11 server may be stalled if we switch away from the
TTY that is hosting the X server.  In this case, don't restart the GPU
process as it will become responsive again when we switch to its TTY.

BUG=355720

Committed: https://crrev.com/9db5a0e3f53edfa3cc653d9d6f8476c17bc7d2b9
Cr-Commit-Position: refs/heads/master@{#394957}
==========

[commit-bot: I haz the power, 2016-05-20 01:58:42]

Patchset 2 (id:??) landed as
https://crrev.com/9db5a0e3f53edfa3cc653d9d6f8476c17bc7d2b9
Cr-Commit-Position: refs/heads/master@{#394957}