Add experimental Swarming builders

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"
 git_repo_url: "https://chromium.googlesource.com/infra/infra.git"
 
 rietveld {
   url: "https://codereview.chromium.org"
@@ skipping 39 matching lines @@
       }
       builders {
         name: "Infra Linux Precise 32 Tester"
       }
       builders {
         name: "Infra Mac Tester"
       }
       builders {
         name: "Infra Win Tester"
       }
+
+      builders {
+        name: "Infra Presubmit (Swarming)"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "Infra Linux Trusty 64 Tester (Swarming)"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "Infra Linux Precise 32 Tester (Swarming)"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "Infra Mac Tester (Swarming)"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "Infra Win Tester (Swarming)"
+        experiment_percentage: 100
+      }
     }
   }
   sign_cla {}
 }