Need to regen cached_patches; new class exposed.

sdk/lib/js/dartium/cached_patches.dart

 // START_OF_CACHED_PATCHES
 // Copyright (c) 2013, 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.
 
 // DO NOT EDIT GENERATED FILE.
 
 library cached_patches;
 
 var cached_patches = {
@@ skipping 964 matching lines @@
 }
 @patch class DomTokenList {
   static Type get instanceRuntimeType => DomTokenListImpl;
 
 }
 class DomTokenListImpl extends DomTokenList implements js_library.JSObjectInterfacesDom {
   DomTokenListImpl.internal_() : super.internal_();
   get runtimeType => DomTokenList;
   toString() => super.toString();
 }
+@patch class DragEvent {
+  static Type get instanceRuntimeType => DragEventImpl;
+
+}
+class DragEventImpl extends DragEvent implements js_library.JSObjectInterfacesDom {
+  DragEventImpl.internal_() : super.internal_();
+  get runtimeType => DragEvent;
+  toString() => super.toString();
+}
 @patch class EffectModel {
   static Type get instanceRuntimeType => EffectModelImpl;
 
 }
 class EffectModelImpl extends EffectModel implements js_library.JSObjectInterfacesDom {
   EffectModelImpl.internal_() : super.internal_();
   get runtimeType => EffectModel;
   toString() => super.toString();
 }
 @patch class Element {
@@ skipping 5275 matching lines @@
 class WaveShaperNodeImpl extends WaveShaperNode implements js_library.JSObjectInterfacesDom {
   WaveShaperNodeImpl.internal_() : super.internal_();
   get runtimeType => WaveShaperNode;
   toString() => super.toString();
 }
 
 """
   ],
 };
 // END_OF_CACHED_PATCHES