Make bucket names explicit in cq.cfg.

infra/config/cq.cfg

Index: infra/config/cq.cfg
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 5fa8ff18c0c69a4a4822751df9fa86cceb97e039..40d05993ba0eaa80f3561f0024a94ae717a44780 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -28,7 +28,7 @@ verifiers {
 # 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.android"
+      name: "master.tryserver.chromium.android"
       builders { name: "android_arm64_dbg_recipe" }
       builders { name: "android_clang_dbg_recipe" }
       builders { name: "android_compile_dbg" }
@@ -40,7 +40,7 @@ verifiers {
       builders { name: "linux_android_rel_ng" }
     }
     buckets {
-      name: "tryserver.chromium.linux"
+      name: "master.tryserver.chromium.linux"
       builders {
         name: "blimp_linux_dbg"
         experiment_percentage: 10
@@ -59,7 +59,7 @@ verifiers {
       builders { name: "linux_chromium_rel_ng" }
     }
     buckets {
-      name: "tryserver.chromium.mac"
+      name: "master.tryserver.chromium.mac"
       builders { name: "ios-device" }
       builders { name: "ios-device-gn" }
       builders { name: "ios-simulator" }
@@ -72,7 +72,7 @@ verifiers {
       }
     }
     buckets {
-      name: "tryserver.chromium.win"
+      name: "master.tryserver.chromium.win"
       builders {
         name: "win10_chromium_x64_rel_ng_exp"
         experiment_percentage: 10