Revert "Revert the revert."

tools/testing/frogpad/frogpad.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 
 """
 Frogpad is used to compile .dart files to javascript.
 
@@ skipping 154 matching lines @@
         self.frogpad_dir)))
 
     # directory of frog compiler source code
     self.frog_dir = os.path.join(self.dart_dir, "frog")
 
     logging.debug("dartdir_dir: '%s'" % self.dart_dir)
     logging.debug("frog_dir: '%s'" % self.frog_dir)
     logging.debug("frogpad_dir: '%s'" % self.frogpad_dir)
 
     # location of frogpad.js
+    # (frogpad.js is generated by running frogsh_bootstrap_wrapper.py)
     if not options.frogpad_js:
       raise Exception("--frogpad_js is required")
 
     if not os.path.exists(options.frogpad_js):
       raise FileNotFoundException(options.frogpad_js)
 
     self.frogpad_js = options.frogpad_js
 
     if options.out:
       # user has specified an output file name
@@ skipping 174 matching lines @@
     raise CommandFailedException(msg)
   logging.debug("SUCCEEDED (%d bytes)" % len(stdout))
   return stdout
 
 
 def main(argv):
   Pad(argv)
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv))