Create master.tryserver.libyuv bucket

cr-buildbucket.cfg

+# Defines buckets on cr-buildbucket.appspot.com, used by to schedule builds
+# on buildbot. In particular, CQ uses some of these buckets to schedule tryjobs.
+#
+# See http://luci-config.appspot.com/schemas/projects:buildbucket.cfg for
+# schema of this file and documentation.
+#
+# Please keep this list sorted by bucket name.
+
+buckets {
+  name: "master.tryserver.libyuv"
+  acls {
+    role: READER
+    group: "all"
+  }
+  acls {
+    role: SCHEDULER
+    group: "project-libyuv-tryjob-access"
+  }
+  acls {
+    role: WRITER
+    identity: "libyuv@chrome-infra-auth.iam.gserviceaccount.com"
+  }
+}