Add an implementation path option to json_schema_compiler

tools/json_schema_compiler/dart_generator_test.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.
 
 import os
 import sys
 import unittest
 
 from compiler import GenerateSchema
@@ skipping 14 matching lines @@
       TESTS_DIR/test_filename.idl
     and compares it to the output in the file:
       TESTS_DIR/test_filename.dart
     '''
     file_rel = os.path.join(TESTS_DIR, test_filename)
 
     output_dir = None
     if REBASE_MODE:
       output_dir = TESTS_DIR
     output_code = GenerateSchema('dart', ['%s.idl' % file_rel], TESTS_DIR,
-                                 output_dir, None, None)
+                                 output_dir, None, None, None)
 
     if not REBASE_MODE:
       with open('%s.dart' % file_rel) as f:
         expected_output = f.read()
       # Remove the first line of the output code (as it contains the filename).
       # Also remove all blank lines, ignoring them from the comparison.
       # Compare with lists instead of strings for clearer diffs (especially with
       # whitespace) when a test fails.
       self.assertEqual([l for l in expected_output.split('\n') if l],
                        [l for l in output_code.split('\n')[1:] if l])
@@ skipping 26 matching lines @@
   def testTags(self):
     self._RunTest('tags')
 
 
 if __name__ == '__main__':
   if '--rebase' in sys.argv:
     print "Running in rebase mode."
     REBASE_MODE = True
     sys.argv.remove('--rebase')
   unittest.main()