Fix ios12-beta-simulator bot.

Bug: 852504
Change-Id: I8599be996f3a556228e4abeda0aedff57b3b49b4
Reviewed-on: https://chromium-review.googlesource.com/c/1258290Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596233}

infra/config/global/cr-buildbucket.cfg

@@ -1456,6 +1456,7 @@ buckets {
     builders { mixins: "ios-ci" name: "ios-simulator-xcode-clang" }
     builders { mixins: "ios-ci" name: "ios-uirefresh-simulator" }
     builders { mixins: "ios-ci" mixins: "fyi-ci" name: "ios-simulator-cronet" }
+    builders { mixins: "ios-ci" mixins: "fyi-ci" name: "ios12-beta-simulator" }
     builders { mixins: "ios-ci" mixins: "fyi-ci" name: "ios12-sdk-device" }
     builders { mixins: "ios-ci" mixins: "fyi-ci" name: "ios12-sdk-simulator" }
     builders { mixins: "ios-ci" mixins: "fyi-ci" name: "ios12-sdk-xcode-clang" }

infra/config/global/luci-milo.cfg

@@ -2621,6 +2621,11 @@ consoles {
     category: "iOS|iOS12"
     short_name: "dev"
   }
+  builders {
+    name: "buildbucket/luci.chromium.ci/ios12-beta-simulator"
+    category: "iOS|iOS12"
+    short_name: "beta"
+  }
   builders {
     name: "buildbucket/luci.chromium.ci/ios12-sdk-simulator"
     category: "iOS|iOS12"

infra/config/global/luci-scheduler.cfg

@@ -294,6 +294,7 @@ trigger {
   triggers: "ios-simulator-xcode-clang"
   triggers: "ios-uirefresh-simulator"
   triggers: "ios11-beta-simulator"
+  triggers: "ios12-beta-simulator"
   triggers: "ios12-sdk-device"
   triggers: "ios12-sdk-simulator"
   triggers: "ios12-sdk-xcode-clang"
@@ -1130,6 +1131,16 @@ job {
   }
 }
 
+job {
+  id: "ios12-beta-simulator"
+  acl_sets: "default"
+  buildbucket: {
+    server: "cr-buildbucket.appspot.com"
+    bucket: "luci.chromium.ci"
+    builder: "ios12-beta-simulator"
+  }
+}
+
 job {
   id: "ios12-sdk-device"
   acl_sets: "default"