Fix an early return and the error status in glLoseContextCHROMIUM impl

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 2522 matching lines @@
     'type': 'PUTn',
     'count': 1,
     'cmd_args': 'GLenum target, GLsizei count, '
         'const GLenum* attachments',
     'decoder_func': 'DoDiscardFramebufferEXT',
     'unit_test': False,
     'client_test': False,
     'extension_flag': 'ext_discard_framebuffer',
   },
   'LoseContextCHROMIUM': {
-    'type': 'Manual',
-    'impl_func': True,
+    'decoder_func': 'DoLoseContextCHROMIUM',
+    'unit_test': False,
     'extension': True,
     'chromium': True,
   },
   'InsertSyncPointCHROMIUM': {
     'type': 'HandWritten',
     'impl_func': False,
     'extension': True,
     'chromium': True,
   },
   'WaitSyncPointCHROMIUM': {
@@ skipping 5782 matching lines @@
       "ppapi/shared_impl/ppb_opengles2_shared.cc"])
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))