infra: add buildbucket-swarming trybots as 100% experiment

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: "infra"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 
 rietveld {
   url: "https://codereview.chromium.org"
 }
 
 verifiers {
   reviewer_lgtm {
      committer_list: "project-infra-committers"
   }
   tree_status {
     tree_status_url: "https://infra-status.appspot.com"
   }
   try_job {
     buckets {
+      name: "chromium.buildbucket.swarming"
+      builders {
+        name: "infra_presubmit"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "infra_linux64"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "infra_mac"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "infra_win"
+        experiment_percentage: 100
+      }
+    }
+    buckets {
       name: "tryserver.infra",
       builders {
         name: "Infra Presubmit"
       }
       builders {
         name: "Infra Linux Trusty 64 Tester"
       }
       builders {
         name: "Infra Linux Precise 32 Tester"
       }
       builders {
         name: "Infra Mac Tester"
       }
       builders {
         name: "Infra Win Tester"
       }
     }
   }
   sign_cla {}
 }