Revert of Test CodecImageGenerator on GPU bots

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 62 matching lines @@
   if 'ANGLE' in bot:
     configs.append('angle')
 
   # We want to run gpudft on atleast the mali 400
   if 'GalaxyS3' in bot:
       configs.append('gpudft')
 
   args.append('--config')
   args.extend(configs)
 
-  # Run tests, gms, and image decoding tests everywhere.
+  # Run tests and gms everywhere,
+  # and image decoding tests everywhere except GPU bots.
   # TODO: remove skp from default --src list?
-  args.extend('--src tests gm image'.split(' '))
+  if 'GPU' in bot:
+    args.extend('--src tests gm'.split(' '))
+  else:
+    args.extend('--src tests gm image'.split(' '))
 
   if 'GalaxyS' in bot:
     args.extend(('--threads', '0'))
 
   blacklist = []
 
   # Certain gm's on win7 gpu and pdf are never finishing and keeping the test
   # running forever
   if 'Win7' in bot:
     blacklist.extend('msaa16 gm _ colorwheelnative'.split(' '))
@@ skipping 134 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)