fix missing SDK symbols

pkg/dev_compiler/lib/src/compiler/code_generator.dart

 // Copyright (c) 2015, 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 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1968 matching lines @@
         _runtimeModule,
         new JS.ArrayInitializer(
             new List<JS.Expression>.from(metadata.map(_instantiateAnnotation)))
       ]));
     }
   }
 
   /// Ensure `dartx.` symbols we will use are present.
   void _initExtensionSymbols(ClassElement classElem,
       List<MethodDeclaration> methods, List<FieldDeclaration> fields) {
-    if (_extensionTypes.hasNativeSubtype(classElem.type)) {
+    if (_extensionTypes.hasNativeSubtype(classElem.type) ||
+        classElem.type.isObject) {
       for (var m in methods) {
-        if (!m.isAbstract &&
-            !m.isStatic &&
-            resolutionMap.elementDeclaredByMethodDeclaration(m).isPublic) {
+        if (!m.isAbstract && !m.isStatic && m.element.isPublic) {
           _declareMemberName(m.element, useExtension: true);
         }
       }
       for (var fieldDecl in fields) {
         if (!fieldDecl.isStatic) {
           for (var field in fieldDecl.fields.variables) {
             var e = field.element as FieldElement;
             if (e.isPublic) {
               _declareMemberName(e.getter, useExtension: true);
             }
@@ skipping 4119 matching lines @@
   '~/': 'floorDivide',
   '*': 'times',
   '%': 'modulo',
   '|': 'bitOr',
   '^': 'bitXor',
   '&': 'bitAnd',
   '<<': 'leftShift',
   '>>': 'rightShift',
   '~': 'bitNot'
 };