Disable bad gif decode on CG

tools/dm_flags.py

 #
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
 #!/usr/bin/env python
 
 usage = '''
@@ skipping 95 matching lines @@
   if 'iOS' in bot:
     blacklist.extend('gpu skp _ _ msaa skp _ _'.split(' '))
     blacklist.extend('msaa16 gm _ tilemodesProcess'.split(' '))
 
   # the 32-bit GCE bots run out of memory in DM when running these large images
   if 'x86' in bot and not 'x86-64' in bot:
     blacklist.extend('_ image _ interlaced1.png'.split(' '))
     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(' '))
     blacklist.extend('_ image gen_platf 8bpp-pixeldata-cropped.bmp'.split(' '))
     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',
                'bleed_image',
                'bleed_alpha_image',
                'bleed_alpha_image_shader',
                'blend',
                'c_gms',
                'colortype',
                'colortype_xfermodes',
@@ skipping 129 matching lines @@
   if len(sys.argv) == 2 and sys.argv[1] == 'test':
     self_test()
     sys.exit(0)
 
   if len(sys.argv) != 3:
     print usage
     sys.exit(1)
 
   with open(sys.argv[1], 'w') as out:
     json.dump(get_args(sys.argv[2]), out)