Disable bad gif decode on CG

This will save me the trouble of triaging this bad image over and
over again :).

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1811943002

Review URL: https://codereview.chromium.org/1811943002
diff --git a/tools/dm_flags.json b/tools/dm_flags.json
index 4edcff3..c2006cd 100644
--- a/tools/dm_flags.json
+++ b/tools/dm_flags.json
@@ -66,6 +66,10 @@
     "image", 
     "gen_platf", 
     "24bpp-pixeldata-cropped.bmp", 
+    "_", 
+    "image", 
+    "gen_platf", 
+    "frame_larger_than_image.gif", 
     "serialize-8888", 
     "gm", 
     "_", 
@@ -2011,6 +2015,10 @@
     "image", 
     "gen_platf", 
     "24bpp-pixeldata-cropped.bmp", 
+    "_", 
+    "image", 
+    "gen_platf", 
+    "frame_larger_than_image.gif", 
     "serialize-8888", 
     "gm", 
     "_", 
diff --git a/tools/dm_flags.py b/tools/dm_flags.py
index 0de32fc..2e3ba7f 100755
--- a/tools/dm_flags.py
+++ b/tools/dm_flags.py
@@ -113,8 +113,8 @@
     blacklist.extend('_ image _ interlaced2.png'.split(' '))
     blacklist.extend('_ image _ interlaced3.png'.split(' '))
 
-  # CG fails on questionable bmps
   if 'Mac' in bot or 'iOS' in bot:
+    # CG fails on questionable bmps
     blacklist.extend('_ image gen_platf rgba32abf.bmp'.split(' '))
     blacklist.extend('_ image gen_platf rgb24prof.bmp'.split(' '))
     blacklist.extend('_ image gen_platf rgb24lprof.bmp'.split(' '))
@@ -122,6 +122,10 @@
     blacklist.extend('_ image gen_platf 4bpp-pixeldata-cropped.bmp'.split(' '))
     blacklist.extend('_ image gen_platf 32bpp-pixeldata-cropped.bmp'.split(' '))
     blacklist.extend('_ image gen_platf 24bpp-pixeldata-cropped.bmp'.split(' '))
+    
+    # CG has unpredictable behavior on this questionable gif
+    # It's probably using uninitialized memory
+    blacklist.extend('_ image gen_platf frame_larger_than_image.gif'.split(' '))
 
   # skia:4095
   for test in ['not_native32_bitmap_config',