Added CQ config for WebRTC

infra/config/cq.cfg

+# Commit Queue configuration file. The documentation of the format can be found
+# at http://luci-config.appspot.com/schemas/projects/refs:cq.cfg.
+
+version: 1
+cq_name: "webrtc"
+cq_status_url: "https://chromium-cq-status.appspot.com"
+commit_burst_delay: 60
+max_commit_burst: 1
+hide_ref_in_committed_msg: true
+target_ref: "refs/pending/heads/master"
+
+rietveld {
+  url: "https://codereview.webrtc.org"
+}
+
+
+verifiers {
+  reviewer_lgtm {
+    committer_list: "webrtc"
+  }
+
+  tree_status {
+    tree_status_url: "https://webrtc-status.appspot.com"
+  }
+
+  try_job {
+    buckets {
+      name: "tryserver.webrtc"
+      builders { name: "linux" }
+    }
+  }
+}