iOS: Add mb_type config for GYP builders.

iOS: Add mb_type config for GYP builders.

Our first build that passed the configuration reading step
failed because of the $(goma_dir) variable. I compared the JSON and
the recipes between ours and the builders in chromium.mac and this was
the only thing I could easily identify, so I'm going to try it out.

Example failing build: https://build.chromium.org/p/client.webrtc.fyi/builders/iOS64%20Simulator%20Debug/builds/97

BUG=chromium:498746
NOTRY=True
TBR=smut@google.com

Committed: https://crrev.com/a7584c9f7507749a09d1883202c152030888addf
Cr-Commit-Position: refs/heads/master@{#11573}

[kjellander_webrtc, 2016-02-11 13:34:45]

Patchset #1 (id:1) has been deleted

[kjellander_webrtc, 2016-02-11 13:34:58]

The CQ bit was checked by kjellander@webrtc.org

[commit-bot: I haz the power, 2016-02-11 13:35:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1693503002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1693503002/20001

[commit-bot: I haz the power, 2016-02-11 13:36:02]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2016-02-11 13:36:15]

Description was changed from

==========
iOS: Add mb_type config for GYP builders.

Our first build that passed the configuration reading step
failed because of the $(goma_dir) variable. I compared the JSON and
the recipes between ours and the builders in chromium.mac and this was
the only thing I could easily identify, so I'm going to try it out.

Example failing build:
https://build.chromium.org/p/client.webrtc.fyi/builders/iOS64%20Simulator%20D...

BUG=chromium:498746
NOTRY=True
TBR=smut@google.com
==========

to

==========
iOS: Add mb_type config for GYP builders.

Our first build that passed the configuration reading step
failed because of the $(goma_dir) variable. I compared the JSON and
the recipes between ours and the builders in chromium.mac and this was
the only thing I could easily identify, so I'm going to try it out.

Example failing build:
https://build.chromium.org/p/client.webrtc.fyi/builders/iOS64%20Simulator%20D...

BUG=chromium:498746
NOTRY=True
TBR=smut@google.com

Committed: https://crrev.com/a7584c9f7507749a09d1883202c152030888addf
Cr-Commit-Position: refs/heads/master@{#11573}
==========

[commit-bot: I haz the power, 2016-02-11 13:36:16]

Patchset 1 (id:??) landed as
https://crrev.com/a7584c9f7507749a09d1883202c152030888addf
Cr-Commit-Position: refs/heads/master@{#11573}