Add a type kind to TypedSelector. A typed selector can either be

sdk/lib/_internal/compiler/implementation/compiler.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;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 215 matching lines @@
   ClassElement boolClass;
   ClassElement numClass;
   ClassElement intClass;
   ClassElement doubleClass;
   ClassElement stringClass;
   ClassElement functionClass;
   ClassElement nullClass;
   ClassElement listClass;
   ClassElement typeClass;
   ClassElement mapClass;
+  ClassElement mapLiteralClass;
   ClassElement jsInvocationMirrorClass;
   /// Document class from dart:mirrors.
   ClassElement documentClass;
   Element assertMethod;
   Element identicalFunction;
   Element functionApplyMethod;
   Element invokeOnMethod;
   Element createInvocationMirrorElement;
 
   Element get currentElement => _currentElement;
@@ skipping 267 matching lines @@
     objectClass = lookupCoreClass('Object');
     boolClass = lookupCoreClass('bool');
     numClass = lookupCoreClass('num');
     intClass = lookupCoreClass('int');
     doubleClass = lookupCoreClass('double');
     stringClass = lookupCoreClass('String');
     functionClass = lookupCoreClass('Function');
     listClass = lookupCoreClass('List');
     typeClass = lookupCoreClass('Type');
     mapClass = lookupCoreClass('Map');
+    // TODO: find a proper way to get to the implementation class.
+    mapLiteralClass = lookupCoreClass('LinkedHashMap');
     if (!missingCoreClasses.isEmpty) {
       internalErrorOnElement(coreLibrary,
           'dart:core library does not contain required classes: '
           '$missingCoreClasses');
     }
 
     final List missingHelperClasses = [];
     ClassElement lookupHelperClass(String name) {
       ClassElement result = jsHelperLibrary.find(new SourceString(name));
       if (result == null) {
@@ skipping 588 matching lines @@
 
   void close() {}
 
   toString() => name;
 
   /// Convenience method for getting an [api.CompilerOutputProvider].
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }