Add helpers library to dart2js.

sdk/lib/_internal/compiler/implementation/elements/elements.dart

 // 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.
 
 library elements;
 
 
 import '../tree/tree.dart';
 import '../util/util.dart';
 import '../resolution/resolution.dart';
@@ skipping 743 matching lines @@
 }
 
 abstract class TypedefElement extends Element
     implements TypeDeclarationElement {
   TypedefType get thisType;
   TypedefType get rawType;
   DartType get alias;
   FunctionSignature get functionSignature;
   Link<DartType> get typeVariables;
 
-  bool get isResolved;
-
   // TODO(kasperl): Try to get rid of these setters.
   void set alias(DartType value);
   void set functionSignature(FunctionSignature value);
 
   void checkCyclicReference(Compiler compiler);
 }
 
 abstract class VariableElement extends Element implements TypedElement {
   Expression get initializer;
 }
@@ skipping 89 matching lines @@
 abstract class TypeDeclarationElement extends Element {
   GenericType get thisType;
   GenericType get rawType;
 
   /**
    * The type variables declared on this declaration. The type variables are not
    * available until the type of the element has been computed through
    * [computeType].
    */
   Link<DartType> get typeVariables;
+
+  bool get isResolved;
 }
 
 abstract class ClassElement extends TypeDeclarationElement
     implements ScopeContainerElement {
   int get id;
 
   /// The length of the longest inheritance path from [:Object:].
   int get hierarchyDepth;
 
   InterfaceType get rawType;
   InterfaceType get thisType;
 
   ClassElement get superclass;
 
   DartType get supertype;
   OrderedTypeSet get allSupertypesAndSelf;
   Link<DartType> get allSupertypes;
   Link<DartType> get interfaces;
 
   bool get hasConstructor;
   Link<Element> get constructors;
 
   ClassElement get patch;
   ClassElement get origin;
   ClassElement get declaration;
   ClassElement get implementation;
 
   int get supertypeLoadState;
   int get resolutionState;
-  bool get isResolved;
   String get nativeTagInfo;
 
   bool get isMixinApplication;
   bool get isUnnamedMixinApplication;
   bool get hasBackendMembers;
   bool get hasLocalScopeMembers;
 
   // TODO(kasperl): These are bit fishy. Do we really need them?
   void set supertype(DartType value);
   void set interfaces(Link<DartType> value);
@@ skipping 212 matching lines @@
   InterfaceType get declarer;
 
   /// Returns `true` if this member is static.
   bool get isStatic;
 
   /// Returns `true` if this member is a getter or setter implicitly declared
   /// by a field.
   bool get isDeclaredByField;
 }