DevTools: move compilation script to inspector/scripts/compile_frontend.py, add closure library.

Source/WebCore/inspector/scripts/generate_protocol_externs.py

 #!/usr/bin/env python
 # Copyright (c) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 174 matching lines @@
 if __name__ == "__main__":
     import sys
     import os.path
     program_name = os.path.basename(__file__)
     if len(sys.argv) < 4 or sys.argv[1] != "-o":
         sys.stderr.write("Usage: %s -o OUTPUT_FILE INPUT_FILE\n" % program_name)
         exit(1)
     output_path = sys.argv[2]
     input_path = sys.argv[3]
     generate_protocol_externs(output_path, input_path)