Add note to chromium cq config to get sign-off from chrome-eng-review per wiki.

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: "chromium"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 hide_ref_in_committed_msg: true
 commit_burst_delay: 60
 max_commit_burst: 2
 target_ref: "refs/pending/heads/master"
 
 rietveld {
   url: "https://codereview.chromium.org"
 }
 
 verifiers {
   reviewer_lgtm {
     committer_list: "external/project-chromium-committers"
   }
 
   tree_status {
     tree_status_url: "https://chromium-status.appspot.com"
   }
 
+# NOTE: when adding new configs to the commit queue, please contact
+# chrome-eng-review per
+# https://sites.google.com/a/chromium.org/dev/developers/testing/chromium-build-infrastructure/tour-of-the-chromium-buildbot?pli=1#TOC-Adding-new-build-configurations-and-tests-to-the-main-Chromium-waterfall-Commit-Queue
   try_job {
     buckets {
       name: "tryserver.chromium.linux"
       builders {
         name: "android_amp_rel_tests_recipe"
         experiment_percentage: 10
       }
       builders { name: "android_arm64_dbg_recipe" }
       builders { name: "android_chromium_gn_compile_dbg" }
       builders { name: "android_chromium_gn_compile_rel" }
@@ skipping 38 matching lines @@
         name: "win_chromium_compile_dbg_ng_exp"
         experiment_percentage: 10
       }
       builders { name: "win8_chromium_ng" }
       builders { name: "win_chromium_compile_dbg_ng" }
       builders { name: "win_chromium_rel_ng" }
       builders { name: "win_chromium_x64_rel_ng" }
     }
   }
 
+# NOTE: when adding new configs to the commit queue, please contact
+# chrome-eng-review per
+# https://sites.google.com/a/chromium.org/dev/developers/testing/chromium-build-infrastructure/tour-of-the-chromium-buildbot?pli=1#TOC-Adding-new-build-configurations-and-tests-to-the-main-Chromium-waterfall-Commit-Queue
+
   sign_cla {}
 }