Support for same prefix for multiple imports.

compiler/java/com/google/dart/compiler/resolver/ElementKind.java

 // Copyright (c) 2011, 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.
 
 package com.google.dart.compiler.resolver;
 
 
 /**
  * Kinds of elements. Use kinds instead of instanceof for maximum flexibility
  * and sharing of similar implementation classes.
  */
 public enum ElementKind {
   CLASS,
   CONSTRUCTOR,
   FIELD,
   FUNCTION_OBJECT,
   LABEL,
   METHOD,
   PARAMETER,
   TYPE_VARIABLE,
   VARIABLE,
   FUNCTION_TYPE_ALIAS,
   DYNAMIC,
   LIBRARY,
+  LIBRARY_PREFIX,
   SUPER,
   NONE,
   VOID;
 
   public static ElementKind of(Element element) {
     if (element != null) {
       return element.getKind();
     } else {
       return NONE;
     }
   }
 }