Add conditional feature to templates.

client/dom/scripts/idlrenderer_test.py

 #!/usr/bin/python
 # Copyright (c) 2011, 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.
 
 import idlnode
 import idlparser
 import idlrenderer
 import logging.config
 import unittest
@@ skipping 25 matching lines @@
     getter attribute int get_attr;
     setter attribute int set_attr;
 
     [A,B=123] void function(in long x, in optional boolean y);
 
     const boolean CONST = 1;
 
     @A @B() @C(x) @D(x=1) @E(x,y=2)
     void something();
   };
+};
+@X module M2 {
+  @Y interface I {};
 };'''
 
     expected_text = \
 '''module M {
-  [Constructor(in long x)] interface I :
-    @A J,
-    K {
+  [Constructor(in long x)]
+  interface I :
+      @A J,
+      K {
 
     /* Constants */
     const boolean CONST = 1;
 
     /* Attributes */
     attribute int attr;
     attribute long attr2;
     getter attribute int get_attr;
     setter attribute int set_attr;
 
     /* Operations */
     [A, B=123] void function(in long x, in optional boolean y);
     @A @B @C(x) @D(x=1) @E(x, y=2) void something();
   };
 };
+@X module M2 {
+  @Y
+  interface I {
+  };
+};
 '''
     self._run_test(input_text, expected_text)
 
 if __name__ == "__main__":
   logging.config.fileConfig("logging.conf")
   if __name__ == '__main__':
     unittest.main()