Reapply "reflectType() dynamic type arguments support (#26012)"

runtime/lib/mirrors_patch.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.
 
 import "dart:async" show Future;
 import "dart:collection" show UnmodifiableListView, UnmodifiableMapView;
 import "dart:_internal" as internal;
 
 /**
  * Returns a [MirrorSystem] for the current isolate.
@@ skipping 15 matching lines @@
 /**
  * Returns a [ClassMirror] for the class represented by a Dart
  * Type object.
  *
  * This only works with objects local to the current isolate.
  */
 @patch ClassMirror reflectClass(Type key) {
   return _Mirrors.reflectClass(key);
 }
 
-@patch TypeMirror reflectType(Type key) {
-  return _Mirrors.reflectType(key);
+@patch TypeMirror reflectType(Type key, [List<Type> typeArguments]) {
+  return _Mirrors.reflectType(key, typeArguments);
 }
 
 @patch class MirrorSystem {
   @patch LibraryMirror findLibrary(Symbol libraryName) {
     var candidates =
         libraries.values.where((lib) => lib.simpleName == libraryName);
     if (candidates.length == 1) {
       return candidates.single;
     }
     if (candidates.length > 1) {
@@ skipping 13 matching lines @@
         ((name.length > 0) && (name[0] == '_') && (library == null))) {
       throw new ArgumentError(library);
     }
     if (library != null) name = _mangleName(name, library._reflectee);
     return new internal.Symbol.unvalidated(name);
   }
 
   static _mangleName(String name, _MirrorReference lib)
       native "Mirrors_mangleName";
 }