Implement 'Sort Members' 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 543 matching lines @@
   AnalysisContext getAnalysisContextForSource(Source source) {
     for (AnalysisContext context in analysisContexts) {
       SourceKind kind = context.getKindOf(source);
       if (kind != SourceKind.UNKNOWN) {
         return context;
       }
     }
     return null;
   }
 
+  /**
+   * Return the analysis driver to which the file with the given [path] is
+   * added if exists, otherwise the first driver, otherwise `null`.
+   */
+  nd.AnalysisDriver getAnalysisDriver(String path) {
+    Iterable<nd.AnalysisDriver> drivers = driverMap.values;
+    if (drivers.isNotEmpty) {
+      return drivers.firstWhere((driver) => driver.isAddedFile(path),
+          orElse: () => drivers.first);
+    }
+    return null;
+  }
+
   CompilationUnitElement getCompilationUnitElement(String file) {
     ContextSourcePair pair = getContextSourcePair(file);
     if (pair == null) {
       return null;
     }
     // prepare AnalysisContext and Source
     AnalysisContext context = pair.context;
     Source unitSource = pair.source;
     if (context == null || unitSource == null) {
       return null;
@@ skipping 1369 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = new PerformanceTag('serverRequests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }