Updates to the diagnostics page.

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.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core';
 import 'dart:io' as io;
 import 'dart:math' show max;
 
@@ skipping 235 matching lines @@
    */
   ServerPerformance performanceDuringStartup = new ServerPerformance();
 
   /**
    * Performance information after initial analysis is complete
    * or `null` if the initial analysis is not yet complete
    */
   ServerPerformance performanceAfterStartup;
 
   /**
+   * Return the total time the server's been alive.
+   */
+  Duration get uptime {
+    DateTime start = new DateTime.fromMillisecondsSinceEpoch(
+        performanceDuringStartup.startTime);
+    return new DateTime.now().difference(start);
+  }
+
+  /**
    * The class into which performance information is currently being recorded.
    * During startup, this will be the same as [performanceDuringStartup]
    * and after startup is complete, this switches to [performanceAfterStartup].
    */
   ServerPerformance _performance;
 
   /**
    * The [Completer] that completes when analysis is complete.
    */
   Completer _onAnalysisCompleteCompleter;
@@ skipping 2102 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');
 }