Reapply "Add TypeVariable object on runtime to support reflection on type variables." and "Fix type…

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.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.
 
 part of dart2js.js_emitter;
 
 /**
  * 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 25 matching lines @@
   final List<ClassElement> deferredClasses = <ClassElement>[];
   final List<ClassElement> nativeClasses = <ClassElement>[];
   final Map<String, String> mangledFieldNames = <String, String>{};
   final Map<String, String> mangledGlobalFieldNames = <String, String>{};
   final Set<String> recordedMangledNames = new Set<String>();
 
   // TODO(ngeoffray): remove this field.
   Set<ClassElement> instantiatedClasses;
 
   JavaScriptBackend get backend => compiler.backend;
+  TypeVariableHandler get typeVariableHandler => backend.typeVariableHandler;
 
   String get _ => space;
   String get space => compiler.enableMinification ? "" : " ";
   String get n => compiler.enableMinification ? "" : "\n";
   String get N => compiler.enableMinification ? "\n" : ";\n";
 
   /**
    * List of expressions and statements that will be included in the
    * precompiled function.
    *
@@ skipping 1500 matching lines @@
   }
 
   bool isDeferred(Element element) {
     return compiler.deferredLoadTask.isDeferred(element);
   }
 
   bool get areAnyElementsDeferred {
     return compiler.deferredLoadTask.areAnyElementsDeferred;
   }
 }