Implement 'Import Library' Quick Fix for the new analysis driver.

pkg/analysis_server/lib/src/analysis_server.dart

 // Copyright (c) 2014, 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.
 
 library analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core';
 import 'dart:io' as io;
@@ skipping 1946 matching lines @@
     // This method is mostly for tests.
     // Context managers manage folders and contexts themselves.
   }
 
   @override
   void removeContext(Folder folder, List<String> flushedFiles) {
     if (analysisServer.options.enableNewAnalysisDriver) {
       sendAnalysisNotificationFlushResults(analysisServer, flushedFiles);
       nd.AnalysisDriver driver = analysisServer.driverMap.remove(folder);
       driver.dispose();
+      // Remove cached priority results for the driver.
+      var results = analysisServer.priorityFileResults;
+      results.keys
+          .where((key) => results[key].driver == driver)
+          .forEach(results.remove);
     } else {
       AnalysisContext context = analysisServer.folderMap.remove(folder);
       sendAnalysisNotificationFlushResults(analysisServer, flushedFiles);
 
       analysisServer.operationQueue.contextRemoved(context);
       analysisServer._onContextsChangedController
           .add(new ContextsChangedEvent(removed: [context]));
       analysisServer.sendContextAnalysisDoneNotifications(
           context, AnalysisDoneReason.CONTEXT_REMOVED);
       context.dispose();
@@ skipping 128 matching lines @@
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }
 
 class _NullStringSink implements StringSink {
   void write(Object obj) {}
   void writeAll(Iterable objects, [String separator = ""]) {}
   void writeCharCode(int charCode) {}
   void writeln([Object obj = ""]) {}
 }