Revert of Remove android_rel from CQ since all of its machines are offline.

Revert of Remove android_rel from CQ since all of its machines are offline. (patchset #1 id:1 of https://codereview.webrtc.org/1459083002/ )

Reason for revert:
Two of the machines are back. They were offline due to extended maintenance work needed.

Original issue's description:
> Remove android_rel from CQ since all of its machines are offline.
>
> BUG=558213
> TBR=phoglund@webrtc.org
>
> Committed: https://crrev.com/392d0c2701ef0112035e496cafcd2e7f0453547f
> Cr-Commit-Position: refs/heads/master@{#10704}

TBR=phoglund@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=558213
Committed: https://crrev.com/0969398277c0ebd6ef988332460e098a8d2d85e6
Cr-Commit-Position: refs/heads/master@{#10705}

[kjellander_webrtc, 2015-11-19 07:57:34]

Created Revert of Remove android_rel from CQ since all of its machines are
offline.

[commit-bot: I haz the power, 2015-11-19 07:57:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1454883004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1454883004/1

[commit-bot: I haz the power, 2015-11-19 07:57:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-19 07:57:58]

Patchset 1 (id:??) landed as
https://crrev.com/0969398277c0ebd6ef988332460e098a8d2d85e6
Cr-Commit-Position: refs/heads/master@{#10705}