Adding support checks for partially supported element types and updating tests.

sdk/lib/html/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."""
 
 from generator import AnalyzeOperation, ConstantOutputOrder, \
     DartDomNameOfAttribute, FindMatchingAttribute, IsDartCollectionType, \
     IsPureInterface, TypeOrNothing
 
 # Types that are accessible cross-frame in a limited fashion.
 # In these cases, the base type (e.g., WindowBase) provides restricted access
 # while the subtype (e.g., Window) provides full access to the
 # corresponding objects if there are from the same frame.
 _secure_base_types = {
   'Window': 'WindowBase',
   'Location': 'LocationBase',
   'History': 'HistoryBase',
 }
 
+
 class HtmlDartGenerator(object):
   def __init__(self, interface, options):
     self._database = options.database
     self._interface = interface
     self._type_registry = options.type_registry
     self._interface_type_info = self._type_registry.TypeInfo(self._interface.id)
     self._renamer = options.renamer
 
+  def EmitSupportCheck(self):
+    if self.HasSupportCheck():
+      support_check = self.GetSupportCheck()
+      self._members_emitter.Emit('\n'
+          '  /**\n'
+          '   * Checks if this type is supported on the current platform\n'
+          '   */\n'
+          '  static bool get supported => $SUPPORT_CHECK;\n',
+          SUPPORT_CHECK=support_check)
+
   def EmitAttributeDocumentation(self, attribute):
     """ Emits the MDN dartdoc comment for an attribute.
     """
     dom_name = DartDomNameOfAttribute(attribute)
     self._members_emitter.Emit('\n  /// @domName $DOMINTERFACE.$DOMNAME;'
                                ' @docsEditable true',
         DOMINTERFACE=attribute.doc_js_interface_name,
         DOMNAME=dom_name)
 
   def EmitOperationDocumentation(self, operation):
@@ skipping 310 matching lines @@
         walk(interface.parents)
       else:
         walk(interface.parents[1:])
     return result
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)
 
   def _IsPrivate(self, name):
     return name.startswith('_')