[CQ] Add experimental bots.

infra/config/cq.cfg

 # See http://luci-config.appspot.com/schemas/projects/refs:cq.cfg for the
 # documentation of this file format.
 
 version: 1
 cq_name: "v8"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 hide_ref_in_committed_msg: true
 commit_burst_delay: 60
 max_commit_burst: 1
 target_ref: "refs/pending/heads/master"
@@ skipping 26 matching lines @@
       builders { name: "v8_linux_mipsel_compile_rel" }
       builders { name: "v8_linux_mips64el_compile_rel" }
       builders { name: "v8_linux_nodcheck_rel" }
       builders { name: "v8_linux_rel" }
       builders { name: "v8_mac_rel" }
       builders { name: "v8_presubmit" }
       builders { name: "v8_win64_rel" }
       builders { name: "v8_win_compile_dbg" }
       builders { name: "v8_win_nosnap_shared_compile_rel" }
       builders { name: "v8_win_rel" }
+      builders {
+        name: "v8_win64_rel_ng"
+        experiment_percentage: 30
+      }
+      builders {
+        name: "v8_win64_rel_ng_triggered"
+        triggered: false

[Michael Achenbach, 2015/11/25 21:13:08]

not entirely sure if I get the syntax right here. Is it false or False? Does the
experiment_percentage make sense at all when triggered is false?

[tandrii(chromium), 2015/11/25 21:15:13]

yep, it's false - verified in in commit_queue code.

+        experiment_percentage: 30

[Michael Achenbach, 2015/11/26 13:45:57]

Meh - this was not useful to add. With the experiment field it seems to ignore
the triggered value. Or did I get the meaning of it wrong???

CQ now _does_ trigger this bot with 30%. I thought false here means it
shouldn't. E.g. this:
https://build.chromium.org/p/tryserver.v8/builders/v8_win64_rel_ng_triggered/...

[tandrii(chromium), 2015/11/26 14:09:40]

Ah, yes, sorry i didn't get this yesterday :(( If you want experimental, then i
guess you should just make sure CQ-triggered build triggers your experimental
builder, but don't tell CQ about that at all.

+      }
     }
   }
 
   sign_cla {}
 }