Adding mac and windows builds for the fyi waterfall.

Bug: 779634
Change-Id: Ifbc4d5736cef4ceda239b5a5efe31533a4a01e78
Reviewed-on: https://chromium-review.googlesource.com/963083Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#543457}

tools/mb/mb_config.pyl

@@ -413,6 +413,8 @@
       'Battor Agent Linux': 'release_bot',
       'Battor Agent Mac': 'release_bot',
       'Battor Agent Win': 'release_bot',
+      'Mac Builder FYI': 'official_goma',
+      'Win Builder FYI': 'official_goma_x86',
     },
 
     'chromium.swarm': {