Add mb config for linux_chromium_headless_rel

Add mb config for linux_chromium_headless_rel

BUG=632008
Committed: https://crrev.com/fb2b97208a79b561b514870669269b6ddbc93d77
Cr-Commit-Position: refs/heads/master@{#425928}

[perezju, 2016-10-17 10:40:50]

perezju@chromium.org changed reviewers:
+ dpranke@chromium.org, skyostil@chromium.org

[perezju, 2016-10-17 10:40:50]

The plan is to land:

1. This chromium CL to add the new config
2. Recipe side https://codereview.chromium.org/2429443002 to switch from dbg ->
rel
3. Another chromium CL to remove the old unused config

[Dirk Pranke, 2016-10-17 17:12:07]

lgtm w/ rename of the files in //build/args if that's okay.

https://codereview.chromium.org/2426553002/diff/1/build/args/bots/tryserver.c...
File build/args/bots/tryserver.chromium.linux/headless_linux_rel_trybot.gn
(right):

https://codereview.chromium.org/2426553002/diff/1/build/args/bots/tryserver.c...
build/args/bots/tryserver.chromium.linux/headless_linux_rel_trybot.gn:2:
is_debug = false
Let's just use the name of the builder for these files, so use
'headless_linux_rel.gn' instead of 'headless_linux_rel_trybot'.

[perezju, 2016-10-18 08:14:45]

Renamed .gn files to match the builder name. Thanks!

[perezju, 2016-10-18 08:14:51]

The CQ bit was checked by perezju@chromium.org

[perezju, 2016-10-18 08:14:51]

The patchset sent to the CQ was uploaded after l-g-t-m from dpranke@chromium.org
Link to the patchset: https://codereview.chromium.org/2426553002/#ps20001
(title: "rename .gn files")

[commit-bot: I haz the power, 2016-10-18 08:15:01]

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, 2016-10-18 09:13:07]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-10-18 09:14:41]

Description was changed from

==========
Add mb config for linux_chromium_headless_rel

BUG=632008
==========

to

==========
Add mb config for linux_chromium_headless_rel

BUG=632008

Committed: https://crrev.com/fb2b97208a79b561b514870669269b6ddbc93d77
Cr-Commit-Position: refs/heads/master@{#425928}
==========

[commit-bot: I haz the power, 2016-10-18 09:14:41]

Patchset 2 (id:??) landed as
https://crrev.com/fb2b97208a79b561b514870669269b6ddbc93d77
Cr-Commit-Position: refs/heads/master@{#425928}