Allow Crashpad to build in the Chromium tree

build/gyp_crashpad.py

 #!/usr/bin/env python
 
 # Copyright 2014 The Crashpad Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
@@ skipping 12 matching lines @@
     0, os.path.join(crashpad_dir, 'third_party', 'gyp', 'gyp', 'pylib'))
 
 import gyp
 
 def main(args):
   if 'GYP_GENERATORS' not in os.environ:
     os.environ['GYP_GENERATORS'] = 'ninja'
 
   crashpad_dir_or_dot = crashpad_dir if crashpad_dir is not '' else '.'
 
+  args.extend(['-D', 'crashpad_standalone=1'])
   args.extend(['--include', os.path.join(crashpad_dir,
                                          'third_party',
                                          'mini_chromium',
                                          'mini_chromium',
                                          'build',
                                          'common.gypi')])
   args.extend(['--depth', crashpad_dir_or_dot])
   args.append(os.path.join(crashpad_dir, 'crashpad.gyp'))
 
   return gyp.main(args)
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))