Adding types to dart:html's dartium files where possible.

tools/dom/scripts/systemnative.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 the systems to generate
 native binding from the IDL database."""
 
 import emitter
 import os
@@ skipping 410 matching lines @@
     dart_declaration = 'void operator[]=(int index, %s value)' % element_type
     self._GenerateNativeBinding('numericIndexSetter', 3, dart_declaration,
         'Callback', True)
 
   def EmitOperation(self, info, html_name):
     """
     Arguments:
       info: An OperationInfo object.
     """
 
-    operation = info.operations[0]
-
-    is_custom = 'Custom' in operation.ext_attrs
-    has_optional_arguments = any(self._IsArgumentOptionalInWebCore(operation, argument) for argument in operation.arguments)
-    needs_dispatcher = not is_custom and (len(info.operations) > 1 or has_optional_arguments)
-
     dart_declaration = '%s%s %s(%s)' % (
         'static ' if info.IsStatic() else '',
         self.SecureOutputType(info.type_name),
         html_name,
-        info.ParametersDeclaration(
-            (lambda x: 'dynamic') if needs_dispatcher else self._DartType))
+        info.ParametersDeclaration(self._DartType))
+
+    operation = info.operations[0]
+    is_custom = 'Custom' in operation.ext_attrs
+    has_optional_arguments = any(self._IsArgumentOptionalInWebCore(operation, argument) for argument in operation.arguments)
+    needs_dispatcher = not is_custom and (len(info.operations) > 1 or has_optional_arguments)
 
     if not needs_dispatcher:
       # Bind directly to native implementation
       argument_count = (0 if info.IsStatic() else 1) + len(info.param_infos)
       cpp_callback_name = self._GenerateNativeBinding(
           info.name, argument_count, dart_declaration, 'Callback', is_custom)
       if not is_custom:
         self._GenerateOperationNativeCallback(operation, operation.arguments, cpp_callback_name)
     else:
       self._GenerateDispatcher(info.operations, dart_declaration, [info.name for info in info.param_infos])
@@ skipping 423 matching lines @@
         LIBRARY_NAME=library_name)
 
       headers = self._library_headers[library_name]
       for header_file in headers:
         path = os.path.relpath(header_file, output_dir)
         includes_emitter.Emit('#include "$PATH"\n', PATH=path)
         body_emitter.Emit(
             '    if (Dart_NativeFunction func = $CLASS_NAME::resolver(name, argumentCount))\n'
             '        return func;\n',
             CLASS_NAME=os.path.splitext(os.path.basename(path))[0])