Added --examine to produce analysis of IDL files

tools/dom/scripts/idlnode.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 os
 import sys
 
 import idl_definitions
 from idl_types import IdlType, IdlNullableType, IdlUnionType, IdlArrayOrSequenceType
@@ skipping 490 matching lines @@
               self._find_first(func_value, 'ExtAttrArgList'))
           continue
 
         self[name] = value
 
   def _all_subnodes(self):
     # Extended attributes may contain IDLNodes, e.g. IDLExtAttrFunctionValue
     return self.values()
 
 
+# IDLExtAttrFunctionValue is used for constructors defined in the IDL.
 class IDLExtAttrFunctionValue(IDLNode):
   """IDLExtAttrFunctionValue."""
   def __init__(self, func_value_ast, arg_list_ast, is_blink=False):
     IDLNode.__init__(self, func_value_ast)
     if is_blink:
       # Blink path
       self.id = func_value_ast   # func_value_ast is the function name for Blink.
       self.arguments = []
       for argument in arg_list_ast:
         self.arguments.append(IDLArgument(argument))
@@ skipping 340 matching lines @@
   """IDLDictNode specialization for one annotation."""
   def __init__(self, ast=None):
     IDLDictNode.__init__(self, ast)
     self.id = None
     if not ast:
       return
     for arg in self._find_all(ast, 'AnnotationArg'):
       name = self._find_first(arg, 'Id')
       value = self._find_first(arg, 'AnnotationArgValue')
       self[name] = value