Add a top-level node in the Files view to display the SDK libraries.

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/model/SystemLibraryManagerProvider.java

 /*
  * Copyright (c) 2012, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 84 matching lines @@
   }
 
   /**
    * Return the manager for VM libraries
    */
   public static EditorLibraryManager getVmLibraryManager() {
     synchronized (lock) {
       if (VM_LIBRARY_MANAGER == null) {
         VM_LIBRARY_MANAGER = new EditorLibraryManager() {
 
-          @Override
-          protected String getPlatformName() {
-            return "runtime";
-          }
-
           /**
            * Return the SDK "lib" directory
            */
           @Override
-          File getLibrariesDir() {
+          public File getLibrariesDir() {
             DartSdk sdk = DartSdk.getInstance();
             if (sdk == null) {
               DartCore.logError("Missing SDK");
             }
             File libDir = sdk.getLibraryDirectory();
             if (!libDir.exists()) {
               DartCore.logError("Missing libraries directory: " + libDir);
             }
             File librariesDir = libDir;
             if (DartCoreDebug.DARTLIB) {
               DartCore.logInformation("Reading bundled libraries from " + librariesDir);
             }
             return librariesDir;
           }
+
+          @Override
+          protected String getPlatformName() {
+            return "runtime";
+          }
         };
       }
     }
     return VM_LIBRARY_MANAGER;
   }
 
   /**
    * Stop any active analysis servers
    */
   public static void stop() {
     synchronized (lock) {
       if (defaultAnalysisServer != null) {
         //defaultAnalysisChangeListener.stop();
         //defaultAnalysisChangeListener = null;
         defaultAnalysisServer.stop();
         defaultAnalysisServer = null;
       }
     }
   }
 }