Add supported checks to the SVG library, and library cleanup.

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 14 matching lines @@
 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()
+      check = self.GetSupportCheck()
+      if type(check) != tuple:
+        signature = 'get supported'
+      else:
+        signature = check[0]
+        check = check[1]
       self._members_emitter.Emit('\n'
           '  /// Checks if this type is supported on the current platform.\n'
-          '  static bool get supported => $SUPPORT_CHECK;\n',
-          SUPPORT_CHECK=support_check)
+          '  static bool $SIGNATURE => $SUPPORT_CHECK;\n',
+          SIGNATURE=signature, SUPPORT_CHECK=check)
 
   def EmitEventGetter(self, events_class_name):
     self._members_emitter.Emit(
         "\n  @DocsEditable"
         "\n  @DomName('EventTarget.addEventListener, "
         "EventTarget.removeEventListener, EventTarget.dispatchEvent')"
         "\n  @deprecated"
         "\n  $TYPE get on =>\n    new $TYPE(this);\n",
         TYPE=events_class_name)
 
@@ skipping 479 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('_')