Introduce TypedefEntity

pkg/compiler/lib/src/js_emitter/program_builder/collector.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.
 
 part of dart2js.js_emitter.program_builder;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 32 matching lines @@
   final Map<OutputUnit, Set<LibraryEntity>> outputLibraryLists =
       new Map<OutputUnit, Set<LibraryEntity>>();
 
   /// True, if the output contains a constant list.
   ///
   /// This flag is updated in [computeNeededConstants].
   bool outputContainsConstantList = false;
 
   final List<ClassElement> nativeClassesAndSubclasses = <ClassElement>[];
 
-  List<TypedefElement> typedefsNeededForReflection;
+  List<TypedefEntity> typedefsNeededForReflection;
 
   Collector(
       this._options,
       this._commonElements,
       this._elementEnvironment,
       this._deferredLoadTask,
       this._worldBuilder,
       this._namer,
       this._emitter,
       this._constantHandler,
@@ skipping 126 matching lines @@
       }
       outputConstantLists
           .putIfAbsent(constantUnit, () => new List<ConstantValue>())
           .add(constant);
     }
   }
 
   /// Compute all the classes and typedefs that must be emitted.
   void computeNeededDeclarations() {
     // Compute needed typedefs.
-    typedefsNeededForReflection = Elements.sortedByPosition(_closedWorld
-        .allTypedefs
+    typedefsNeededForReflection = _sorter.sortTypedefs(_closedWorld.allTypedefs
         .where(_mirrorsData.isTypedefAccessibleByReflection)
         .toList());
 
     // Compute needed classes.
     Set<ClassEntity> instantiatedClasses =
         // TODO(johnniwinther): This should be accessed from a codegen closed
         // world.
         _worldBuilder.directlyInstantiatedClasses
             .where(computeClassFilter())
             .toSet();
@@ skipping 141 matching lines @@
   }
 
   void collect() {
     computeNeededDeclarations();
     computeNeededConstants();
     computeNeededStatics();
     computeNeededStaticNonFinalFields();
     computeNeededLibraries();
   }
 }