[chromium.clang] Add iOS device tester to console.

Change-Id: I0e684cf415f600fd640abafd9b103a261b1032fe
Reviewed-on: https://chromium-review.googlesource.com/1098627Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566922}

infra/config/global/luci-milo.cfg

@@ -2067,7 +2067,11 @@ consoles {
   }
   builders {
     name: "buildbot/chromium.clang/ToTiOS"
-    short_name: "iOS"
+    short_name: "iOS|fat"
+  }
+  builders {
+    name: "buildbot/chromium.clang/clang_tot_device"
+    short_name: "iOS|dev"
   }
   builders {
     name: "buildbot/chromium.clang/UBSanVptr Linux"