Only use 256x256 tiles on hd2000 nanobench bots

tools/nanobench_flags.py

 #!/usr/bin/env python
 
 usage = '''
 Write extra flags to outfile for nanobench based on the bot name:
   $ python nanobench_flags.py outfile Perf-Android-GalaxyS3-Mali400-Arm7-Release
 Or run self-tests:
   $ python nanobench_flags.py test
 '''
 
 import inspect
@@ skipping 27 matching lines @@
 
   if 'Valgrind' in bot:
     # Don't care about Valgrind performance.
     args.extend(['--loops',   '1'])
     args.extend(['--samples', '1'])
     if 'Valgrind_GPU' in bot:
       args.append('--nocpu')
     elif 'Valgrind_CPU' in bot:
       args.append('--nogpu')
 
+  if 'HD2000' in bot:
+    args.extend(['--benchTileW', '256'])
+    args.extend(['--benchTileH', '256'])
+
   match = []
   if 'Android' in bot:
     # Segfaults when run as GPU bench. Very large texture?
     match.append('~blurroundrect')
     match.append('~patch_grid')  # skia:2847
     match.append('~desk_carsvg')
   if 'HD2000' in bot:
     match.extend(['~gradient', '~etc1bitmap'])  # skia:2895
   if 'Nexus7' in bot:
     match = ['skp']  # skia:2774
@@ skipping 42 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)