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

chrome/browser/resources/net_internals/eventsview.js

Index: chrome/browser/resources/net_internals/eventsview.js
===================================================================
--- chrome/browser/resources/net_internals/eventsview.js	(revision 72508)
+++ chrome/browser/resources/net_internals/eventsview.js	(working copy)
@@ -475,10 +475,20 @@
 /**
  * Called whenever all log events are deleted.
  */
-EventsView.prototype.onAllLogEntriesDeleted = function(offset) {
+EventsView.prototype.onAllLogEntriesDeleted = function() {
   this.initializeSourceList_();
 };
 
+/**
+ * Called when either a log file is loaded or when going back to actively
+ * logging events.  In either case, called after clearing the old entries,
+ * but before getting any new ones.
+ */
+EventsView.prototype.onSetIsViewingLogFile = function(isViewingLogFile) {
+  // Needed to sort new sourceless entries correctly.
+  this.maxReceivedSourceId_ = 0;
+};
+
 EventsView.prototype.incrementPrefilterCount = function(offset) {
   this.numPrefilter_ += offset;
   this.invalidateFilterCounter_();