Only allow TexStorage2DEXT if we expose the extension

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 4050 matching lines @@
   },
   'CompressedCopyTextureCHROMIUM': {
     'decoder_func': 'DoCompressedCopyTextureCHROMIUM',
     'unit_test': False,
     'extension': 'CHROMIUM_copy_compressed_texture',
     'chromium': True,
   },
   'TexStorage2DEXT': {
     'unit_test': False,
     'extension': 'EXT_texture_storage',
+    'extension_flag': 'ext_texture_storage',
     'decoder_func': 'DoTexStorage2DEXT',
     'trace_level': 2,
   },
   'DrawArraysInstancedANGLE': {
     'type': 'Manual',
     'cmd_args': 'GLenumDrawMode mode, GLint first, GLsizei count, '
                 'GLsizei primcount',
     'extension': 'ANGLE_instanced_arrays',
     'unit_test': False,
     'pepper_interface': 'InstancedArrays',
@@ skipping 7450 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:]))