Reland of add a Chrome builder to the CQ

infra/branch-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: "skia"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 commit_burst_delay: 300
 max_commit_burst: 2
 
 rietveld {
@@ skipping 29 matching lines @@
       builders { name: "Build-Ubuntu-GCC-Mips-Debug-Android-Trybot" }
       builders { name: "Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot" }
       builders { name: "Build-Ubuntu-GCC-x86_64-Release-Trybot" }
       builders { name: "Build-Win-MSVC-x86-Debug-Trybot" }
       builders { name: "Build-Win-MSVC-x86_64-Debug-Trybot" }
     }
     buckets {
       name: "client.skia.fyi"
       builders { name: "skia_presubmit-Trybot" }
     }
+    buckets {
+      name: "master.tryserver.chromium.mac"
+      # At time of writing, this is the fastest Chrome compile bot on average.
+      builders { name: "mac_chromium_compile_dbg_ng" }
+    }
     try_job_retry_config {
       try_job_retry_quota: 1
       global_retry_quota: 2
       failure_retry_weight: 2
       transient_failure_retry_weight: 1
       timeout_retry_weight: 2
     }
   }
 
   sign_cla {}
 }