Support custom constructors with signature declaration.

lib/dom/scripts/generator.py

 #!/usr/bin/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.
 
 """This module provides shared functionality for systems to generate
 Dart APIs from the IDL database."""
 
 import copy
 import re
@@ skipping 257 matching lines @@
 
 def AnalyzeConstructor(interface):
   """Returns an OperationInfo object for the constructor.
 
   Returns None if the interface has no Constructor.
   """
   def GetArgs(func_value):
     return map(lambda arg: _DartArg([arg], interface, True),
                func_value.arguments)
 
+  if 'CustomConstructor' in interface.ext_attrs:
+    return None
   if 'Constructor' in interface.ext_attrs:
     name = None
     func_value = interface.ext_attrs.get('Constructor')
     if func_value:
       # [Constructor(param,...)]
       args = GetArgs(func_value)
       idl_args = func_value.arguments
     else: # [Constructor]
       args = []
       idl_args = []
@@ skipping 505 matching lines @@
     '"SVGAnimatedListPropertyTearOff.h"',
     '"SVGTransformListPropertyTearOff.h"',
     '"SVGPathSegListPropertyTearOff.h"',
 ]
 
 def GetIDLTypeInfo(idl_type_name):
   match = re.match(r'sequence<(\w+)>$', idl_type_name)
   if match:
     return SequenceIDLTypeInfo(idl_type_name, GetIDLTypeInfo(match.group(1)))
   return _idl_type_registry.get(idl_type_name, IDLTypeInfo(idl_type_name))