Update data reduction proxy statistics prefs less often on desktop

chrome/browser/resources/net_internals/bandwidth_view.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** This view displays summary statistics on bandwidth usage. */
 var BandwidthView = (function() {
   'use strict';
 
   // We inherit from DivView.
   var superClass = DivView;
@@ skipping 55 matching lines @@
      */
     updateBandwidthUsageTable_: function() {
       var sessionNetworkStats = this.sessionNetworkStats_;
       var historicNetworkStats = this.historicNetworkStats_;
       if (!sessionNetworkStats || !historicNetworkStats)
         return false;
 
       var sessionOriginal = sessionNetworkStats.session_original_content_length;
       var sessionReceived = sessionNetworkStats.session_received_content_length;
       var historicOriginal =
-          historicNetworkStats.historic_original_content_length;
+          historicNetworkStats.historic_original_content_length +
+          sessionOriginal;
       var historicReceived =
-          historicNetworkStats.historic_received_content_length;
+          historicNetworkStats.historic_received_content_length +
+          sessionReceived;

[mmenke, 2014/09/15 15:11:02]

Why the change?  We still include session prefs in kHttpReceivedContentLength,
don't we?  We just don't update the two as often.

[megjablon, 2014/09/15 18:19:23]

Ah I didn't understand how historic_received_content_length was being updated.
Ya, this won't work, but historic values will only be updated with the session
values added in every hour. 

 
       var rows = [];
       rows.push({
           title: 'Original (KB)',
           sessionValue: bytesToRoundedKilobytes_(sessionOriginal),
           historicValue: bytesToRoundedKilobytes_(historicOriginal)
       });
       rows.push({
           title: 'Received (KB)',
           sessionValue: bytesToRoundedKilobytes_(sessionReceived),
@@ skipping 31 matching lines @@
    */
   function getPercentSavings_(original, received) {
     if (original > 0) {
       return ((original - received) * 100 / original).toFixed(1);
     }
     return '0.0';
   }
 
   return BandwidthView;
 })();