Support overloaded constructors.

tools/dom/scripts/idlrenderer.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.
 
 from idlnode import *
 
 
 def render(idl_node, indent_str='  '):
   output = []
@@ skipping 103 matching lines @@
         for k in sorted(node):
           if i > 0:
             w(', ')
           w(k)
           v = node[k]
           if v is not None:
             if isinstance(v, IDLExtAttrFunctionValue):
               if v.id:
                 w('=')
               w(v)
+            elif isinstance(v, list):
+              assert k == 'Constructor'
+              w(v[0])
+              for c in v[1:]:
+                w(', '); w(k); w(c)
             else:
               w('=%s' % v.__str__())
           i += 1
         w(']')
     elif isinstance(node, IDLExtAttrFunctionValue):
       if node.id:
         w(node.id)
       w('(')
       w(node.arguments, ', ')
       w(')')
@@ skipping 34 matching lines @@
     elif isinstance(node, IDLArgument):
       wsp(node.ext_attrs)
       w('in ')
       w('%s %s' % (node.type.id, node.id))
     else:
       raise TypeError("Expected str or IDLNode but %s found" %
         type(node))
 
   w(idl_node)
   return ''.join(output)