Blacklist fontscalerdistortable on Win8.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=2109583003

Review-Url: https://codereview.chromium.org/2109583003
diff --git a/tools/dm_flags.py b/tools/dm_flags.py
index 9672849..4a4175c 100755
--- a/tools/dm_flags.py
+++ b/tools/dm_flags.py
@@ -167,7 +167,12 @@
     # is fairly slow and not platform-specific. So we just disable it on all of
     # Android and iOS. skia:5438
     blacklist.extend('_ test _ GrShape'.split(' '))
- 
+
+  if 'Win8' in bot:
+    # bungeman: "Doesn't work on Windows anyway, produces unstable GMs with
+    # 'Unexpected error' from DirectWrite"
+    blacklist.extend('_ gm _ fontscalerdistortable'.split(' '))
+
   # skia:4095
   for test in ['bleed_image',
                'c_gms',
@@ -290,6 +295,7 @@
     'Test-Win-MSVC-GCE-CPU-AVX2-x86_64-Debug',
     'Test-Win10-MSVC-ShuttleA-GPU-GTX660-x86_64-Debug-Vulkan',
     'Test-Win7-MSVC-ShuttleA-GPU-HD2000-x86-Debug-ANGLE',
+    'Test-Win8-MSVC-GCE-CPU-AVX2-x86_64-Debug',
   ]
 
   cov = coverage.coverage()