Order the vm's isolate list by isolate start time.

runtime/observatory/lib/src/elements/debugger.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 debugger_page_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/cli.dart';
@@ skipping 787 matching lines @@
             "Switching to isolate ${candidate.number} '${candidate.name}'");
         debugger.isolate = candidate;
       }
     }
     return new Future.value(null);
   }
 
   Future<List<String>> complete(List<String> args) {
     if (args.length != 1) {
       return new Future.value([args.join('')]);
-    }
-    var isolates = debugger.vm.isolates.toList();
-    isolates.sort((a, b) => a.startTime.compareTo(b.startTime));
+    } 
     var result = [];
-    for (var isolate in isolates) {
+    for (var isolate in debugger.vm.isolates) {
       var str = isolate.number.toString();
       if (str.startsWith(args[0])) {
         result.add('$str ');
       }
     }
-    for (var isolate in isolates) {
+    for (var isolate in debugger.vm.isolates) {
       if (isolate.name.startsWith(args[0])) {
         result.add('${isolate.name} ');
       }
     }
     return new Future.value(result);
   }
   String helpShort = 'Switch the current isolate';
 
   String helpLong =
       'Switch the current isolate.\n'
       '\n'
       'Syntax: isolate <number>\n'
       '        isolate <name>\n';
 }
 
 class IsolateListCommand extends DebuggerCommand {
   IsolateListCommand(Debugger debugger) : super(debugger, 'list', []);
 
   Future run(List<String> args) {
     if (debugger.vm == null) {
       debugger.console.print(
           "Internal error: vm has not been set");
       return new Future.value(null);
     }
-    var isolates = debugger.vm.isolates.toList();
-    isolates.sort((a, b) => a.startTime.compareTo(b.startTime));
-    for (var isolate in isolates) {
+    for (var isolate in debugger.vm.isolates) {
       String current = (isolate == debugger.isolate ? ' *' : '');
       debugger.console.print(
           "Isolate ${isolate.number} '${isolate.name}'${current}");
     }
     return new Future.value(null);
   }
 
   String helpShort = 'List all isolates';
 
   String helpLong =
@@ skipping 1151 matching lines @@
         }
       });
   }
 
   void focus() {
     $['textBox'].focus();
   }
 
   DebuggerInputElement.created() : super.created();
 }