Migrate to Chrome 37 IDL

tools/dom/scripts/htmldartgenerator.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 system to generate
 dart:html APIs from the IDL database."""
 
 import emitter
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 336 matching lines @@
         call_emitter = call_emitter.Emit('$(INDENT)$!CALL;\n$(INDENT)return;\n')
       else:
         call_emitter = call_emitter.Emit('$(INDENT)return $!CALL;\n')
 
       version[0] += 1
       generate_call(stmts_emitter, call_emitter,
           version[0], signature_index, argument_count)
 
     def GenerateChecksAndCall(signature_index, argument_count):
       checks = []
+      typechecked_interface = \
+          ('TypeChecking' in self._interface.ext_attrs) and \
+          ('Interface' in self._interface.ext_attrs['TypeChecking'])
+
       for i in reversed(range(0, argument_count)):
         argument = signatures[signature_index][i]
         parameter_name = parameter_names[i]
 
         test_type = self._NarrowToImplementationType(argument.type.id)
 
         if test_type in ['dynamic', 'Object']:
           checks.append('%s != null' % parameter_name)
         elif not can_omit_type_check(test_type, i):
-          checks.append('(%s is %s || %s == null)' % (
-              parameter_name, test_type, parameter_name))
+          typechecked = typechecked_interface or \
+              ('TypeChecking' in argument.ext_attrs) and \
+              ('Interface' in argument.ext_attrs['TypeChecking'])
+          converts_null = \
+              ('TreatNullAs' in argument.ext_attrs) or \
+              (argument.default_value is not None) or \
+              (argument.default_value_is_null)
+          if argument.type.nullable or converts_null or not typechecked:
+            checks.append('(%s is %s || %s == null)' % (
+                parameter_name, test_type, parameter_name))
+          else:
+            checks.append('(%s is %s)' % (
+                parameter_name, test_type))
         elif i >= number_of_required_in_dart:
           checks.append('%s != null' % parameter_name)
 
       # There can be multiple presence checks.  We need them all since a later
       # optional argument could have been passed by name, leaving 'holes'.
       checks.extend(['%s == null' % name for name in parameter_names[argument_count:]])
 
       GenerateCall(signature_index, argument_count, checks)
 
     # TODO: Optimize the dispatch to avoid repeated checks.
@@ skipping 361 matching lines @@
     return self._type_registry.TypeInfo(type_name).narrow_dart_type()
 
   def _NarrowInputType(self, type_name):
     return self._NarrowToImplementationType(type_name)
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)
 
   def _TypeInfo(self, type_name):
     return self._type_registry.TypeInfo(type_name)