improve completion performance status page

pkg/analysis_server/lib/src/get_handler.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 get.handler;
 
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/domain_completion.dart';
 import 'package:analysis_server/src/socket_server.dart';
 import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 import 'analysis_server.dart';
 
 /**
  * Instances of the class [GetHandler] handle GET requests.
  */
 class GetHandler {
@@ skipping 535 matching lines @@
     }
     if (maxCount is String) {
       int count = int.parse(maxCount, onError: (_) => 0);
       handler.performanceListMaxLength = count;
     }
     CompletionPerformance performance = handler.performance;
     if (performance == null) {
       response.write('<p>No performance stats yet</p>');
       return;
     }
+    response.write('<h2>Last Completion Performance</h2>');
     response.write('<table>');
     _writeRow(response, ['Elapsed', '', 'Operation'], header: true);
     performance.operations.forEach((OperationPerformance op) {
       String elapsed = op.elapsed != null ? op.elapsed.toString() : '???';
       _writeRow(response, [elapsed, '&nbsp;&nbsp;', op.name]);
     });
     if (handler.priorityChangedPerformance == null) {
       response.write('<p>No priorityChanged caching</p>');
     } else {
       int len = handler.priorityChangedPerformance.operations.length;
       if (len > 0) {
         var op = handler.priorityChangedPerformance.operations[len - 1];
         if (op != null) {
           _writeRow(response, ['&nbsp;', '&nbsp;', '&nbsp;']);
           String elapsed = op.elapsed != null ? op.elapsed.toString() : '???';
           _writeRow(response, [elapsed, '&nbsp;&nbsp;', op.name]);
         }
       }
     }
     response.write('</table>');
     if (handler.performanceList.length > 0) {
+      response.write('<h2>Last Completion Summary</h2>');
       response.write('<table>');
       _writeRow(
           response,
-          ['Milliseconds', '', '# Notifications', '', '# Suggestions', '', 'Snippet'],
+          [
+              'Start Time',
+              '',
+              'First (ms)',
+              '',
+              'Complete (ms)',
+              '',
+              '# Notifications',
+              '',
+              '# Suggestions',
+              '',
+              'Snippet'],
           header: true);
       handler.performanceList.forEach((CompletionPerformance performance) {
         _writeRow(
             response,
             [
+                performance.start,
+                '&nbsp;&nbsp;',
+                performance.firstNotificationInMilliseconds,
+                '&nbsp;&nbsp;',
                 performance.elapsedInMilliseconds,
                 '&nbsp;&nbsp;',
                 performance.notificationCount,
                 '&nbsp;&nbsp;',
                 performance.suggestionCount,
                 '&nbsp;&nbsp;',
                 performance.snippet]);
       });
       response.write('</table>');
     }
@@ skipping 26 matching lines @@
       if (header) {
         response.write('</th>');
       } else {
         response.write('</td>');
       }
     }
 
     response.write('</tr>');
   }
 }