Cache GL's viewport on the GPU command buffer client side.

gpu/command_buffer/build_gles2_cmd_buffer.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """code generator for GLES2 command buffers."""
 
 import itertools
 import os
 import os.path
@@ skipping 3988 matching lines @@
     'impl_func': False,
     'client_test': False,
     'es3': True,
     'trace_level': 1,
   },
   'Scissor': {
     'type': 'StateSet',
     'state': 'Scissor',
   },
   'Viewport': {
+    'impl_func': False,
     'decoder_func': 'DoViewport',
   },
   'ResizeCHROMIUM': {
     'type': 'Custom',
     'impl_func': False,
     'extension': True,
     'trace_level': 1,
   },
   'GetRequestableExtensionsCHROMIUM': {
     'type': 'Custom',
@@ skipping 7177 matching lines @@
   Format(gen.generated_cpp_filenames)
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))