cq: enable more LUCI try builders

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"
 git_repo_url: "https://chromium.googlesource.com/chromium/src"
 commit_burst_delay: 60
 max_commit_burst: 2
 
@@ skipping 16 matching lines @@
   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: "luci.chromium.try"
+      # Builders in this bucket are defined in
+      # https://chromium.googlesource.com/chromium/src/+/infra/config/cr-buildbucket.cfg
       builders {
         name: "LUCI linux_chromium_rel_ng"
-        experiment_percentage: 1
+        experiment_percentage: 5
+      }
+      builders {
+        name: "LUCI mac_chromium_rel_ng"
+        experiment_percentage: 5
+      }
+      builders {
+        name: "LUCI win_chromium_rel_ng"
+        experiment_percentage: 5
       }
     }
     buckets {
       name: "master.tryserver.chromium.android"
       builders { name: "android_arm64_dbg_recipe" }
       builders { name: "android_clang_dbg_recipe" }
       builders { name: "android_compile_dbg" }
       builders { name: "android_cronet" }
       builders { name: "android_n5x_swarming_rel" }
       builders { name: "cast_shell_android" }
@@ skipping 47 matching lines @@
       builders { name: "win_clang" }
     }
   }
 
 # 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 {}
 }