Adds the ability to load JSON log files to about:net-internals.

chrome/browser/resources/net_internals/tabswitcherview.js

Index: chrome/browser/resources/net_internals/tabswitcherview.js
===================================================================
--- chrome/browser/resources/net_internals/tabswitcherview.js	(revision 72508)
+++ chrome/browser/resources/net_internals/tabswitcherview.js	(working copy)
@@ -136,6 +136,13 @@
   return ids;
 };
 
+// Shows/hides the DOM node that is used to select the tab.  Will not change
+// the active tab.
+TabSwitcherView.prototype.showTabHandleNode = function(id, isVisible) {
+  var tab = this.findTabById(id);
+  setNodeDisplay(tab.getTabHandleNode(), isVisible);
+};
+
 //-----------------------------------------------------------------------------
 
 /**