autoroller: Add CQ_EXTRA_TRYBOTS, CQ feature and --skip-cq flag.

autoroller: Add CQ_EXTRA_TRYBOTS, CQ feature and --skip-cq flag.

Always send the CL to the CQ, except if --skip-cq is provided.
Add extra CQ trybots, since the baremetal ones are no longer the default.

BUG=webrtc:4688
R=phoglund@webrtc.org

Committed: https://crrev.com/417fec21f656e708fe831e81eff5b3647fdb94b9
Cr-Commit-Position: refs/heads/master@{#10146}

[kjellander_webrtc, 2015-10-02 06:41:31]

kjellander@webrtc.org changed reviewers:
+ phoglund@webrtc.org

[kjellander_webrtc, 2015-10-02 06:41:31]

This should be the final piece.

[phoglund, 2015-10-02 08:45:09]

Sending to the CQ should just piggyback on the already started tryjob right,
rather than starting a new tryjob just after the first one?

[kjellander_webrtc, 2015-10-02 10:50:20]

On 2015/10/02 08:45:09, phoglund wrote:
> Sending to the CQ should just piggyback on the already started tryjob right,
> rather than starting a new tryjob just after the first one?

Yeah, it won't trigger additional ones. I wanted to keep the flexibility of
creating a CL and run tryjobs without CQ as well (when running the script
manually).
The default could just have skipped the git cl try invocation, but I felt it
would just make the code harder to read.

[phoglund, 2015-10-02 11:32:45]

ok, lgtm

[kjellander_webrtc, 2015-10-02 11:40:06]

Committed patchset #3 (id:40001) manually as
417fec21f656e708fe831e81eff5b3647fdb94b9 (presubmit successful).

[commit-bot: I haz the power, 2015-10-02 11:40:09]

Patchset 3 (id:??) landed as
https://crrev.com/417fec21f656e708fe831e81eff5b3647fdb94b9
Cr-Commit-Position: refs/heads/master@{#10146}