Add WebIDL compliant parser plus tests

tools/idl_parser/run_tests.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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 glob
 import sys
 import unittest
 
 if __name__ == '__main__':
-  testlist = glob.glob('*_test.py')
-  for testname in testlist:
-    unittest.main(verbosity=2, module=testname[:-3])
+  suite = unittest.TestSuite()
+  for testname in glob.glob('idl_parser_test.py'):
+    print 'Adding Test: ' + testname
+    module = __import__(testname[:-3])
+    suite.addTests(unittest.defaultTestLoader.loadTestsFromModule(module))
+  result = unittest.TextTestRunner(verbosity=2).run(suite)
+  if result.wasSuccessful():
+    sys.exit(0)
+  else:
+    sys.exit(1)