Add a timeline view to about:net-internals.

chrome/browser/resources/net_internals/proxy_view.js

 // Copyright (c) 2011 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 information on the proxy setup:
  *
  *   - Shows the current proxy settings.
  *   - Has a button to reload these settings.
  *   - Shows the log entries for the most recent INIT_PROXY_RESOLVER source
@@ skipping 19 matching lines @@
 
     // Hook up the UI components.
     $(ProxyView.RELOAD_SETTINGS_BUTTON_ID).onclick =
         g_browser.sendReloadProxySettings.bind(g_browser);
     $(ProxyView.CLEAR_BAD_PROXIES_BUTTON_ID).onclick =
         g_browser.sendClearBadProxies.bind(g_browser);
 
     // Register to receive proxy information as it changes.
     g_browser.addProxySettingsObserver(this, true);
     g_browser.addBadProxiesObserver(this, true);
-    g_browser.sourceTracker.addObserver(this);
+    g_browser.sourceTracker.addSourceEntryObserver(this);
   }
 
   // ID for special HTML element in category_tabs.html
   ProxyView.TAB_HANDLE_ID = 'tab-handle-proxy';
 
   // IDs for special HTML elements in proxy_view.html
   ProxyView.MAIN_BOX_ID = 'proxy-view-tab-content';
   ProxyView.ORIGINAL_SETTINGS_DIV_ID = 'proxy-view-original-settings';
   ProxyView.EFFECTIVE_SETTINGS_DIV_ID = 'proxy-view-effective-settings';
   ProxyView.RELOAD_SETTINGS_BUTTON_ID = 'proxy-view-reload-settings';
@@ skipping 111 matching lines @@
         this.clearLog_();
     },
 
     onAllSourceEntriesDeleted: function() {
       this.clearLog_();
     }
   };
 
   return ProxyView;
 })();