Blacklist serialize-8888 typefacerendering_pfaMac

BUG=skia:5778
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2356753003

TBR=halcanary@google.com
NOTREECHECKS=true
CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Mac-Clang-MacMini6.2-CPU-AVX-x86_64-Debug-GN-Trybot

Review-Url: https://codereview.chromium.org/2356753003
diff --git a/infra/bots/recipes/swarm_test.py b/infra/bots/recipes/swarm_test.py
index 2de5635..df79f75 100644
--- a/infra/bots/recipes/swarm_test.py
+++ b/infra/bots/recipes/swarm_test.py
@@ -263,6 +263,8 @@
   bad_serialize_gms.extend(['composeshader_bitmap',
                             'scaled_tilemodes_npot',
                             'scaled_tilemodes'])
+  # skia:5778
+  bad_serialize_gms.append('typefacerendering_pfaMac')
   for test in bad_serialize_gms:
     blacklist(['serialize-8888', 'gm', '_', test])