Handle session logs and add event subset selection

pkg/analysis_server/tool/instrumentation/page/stats_page.dart

 // Copyright (c) 2016, 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:collection';
 
 import '../log/log.dart';
 import 'page_writer.dart';
 
 /**
@@ skipping 34 matching lines @@
    * Initialize a newly created page writer to write information about the given
    * instrumentation [log].
    */
   StatsPage(this.log) {
     _processEntries(log.logEntries);
   }
 
   @override
   void writeBody(StringSink sink) {
     writeMenu(sink);
-    sink.writeln('<div id="container">');
-    sink.writeln('  <div id="content">');
-    sink.writeln('    <div id="leftColumn">');
-    sink.writeln('      <div class="inset">');
-    _writeLeftColumn(sink);
-    sink.writeln('      </div>');
-    sink.writeln('    </div>');
-    sink.writeln('    <div id="rightColumn">');
-    sink.writeln('      <div class="inset">');
-    _writeRightColumn(sink);
-    sink.writeln('      </div>');
-    sink.writeln('    </div>');
-    sink.writeln('  </div>');
-    sink.writeln('</div>');
+    writeTwoColumns(
+        sink, 'leftColumn', _writeLeftColumn, 'rightColumn', _writeRightColumn);
   }
 
   /**
    * Write the content of the style sheet (without the 'script' tag) for the
    * page to the given [sink].
    */
   void writeStyleSheet(StringSink sink) {
     super.writeStyleSheet(sink);
-    sink.writeln(r'''
-#leftColumn {
-  float: left;
-  height: 100%;
-  overflow: auto;
-  width: 50%;
-}
-#rightColumn {
-  float: right;
-  height: 100%;
-  overflow: auto;
-  width: 50%;
-}
-''');
+    writeTwoColumnStyles(sink, 'leftColumn', 'rightColumn');
   }
 
   /**
    * Return the mean of the values in the given list of [values].
    */
   int _mean(List<int> values) {
     int sum = values.fold(0, (int sum, int latency) => sum + latency);
     return sum ~/ values.length;
   }
 
@@ skipping 122 matching lines @@
     sink.write('<p>');
     sink.write('<span class="label">Time to first notification:</span> ');
     sink.write(completionResponseTimes[0]);
     sink.write(', ');
     sink.write(_mean(completionResponseTimes));
     sink.write(', ');
     sink.write(completionResponseTimes[completionResponseTimes.length - 1]);
     sink.writeln('</p>');
   }
 }