[cq] Add temporary gyp bot to CQ experiment

BUG=chromium:474921
NOTRY=true
TBR=vogelheim@chromium.org, jochen@chromium.org

Review-Url: https://codereview.chromium.org/2129853002
Cr-Commit-Position: refs/heads/master@{#37573}

infra/config/cq.cfg

@@ -37,6 +37,10 @@ verifiers {
         name: "v8_linux64_avx2_rel_ng_triggered"
         triggered_by: "v8_linux64_avx2_rel_ng"
       }
+      builders {
+        name: "v8_linux64_gyp_rel_ng"
+        experiment_percentage: 100
+      }
       builders { name: "v8_linux64_rel_ng" }
       builders {
         name: "v8_linux64_rel_ng_triggered"