Add a source id to global NetLog entries.

chrome/browser/resources/net_internals/source_tracker.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.
 
 var SourceTracker = (function() {
   'use strict';
 
   /**
    * This class keeps track of all NetLog events, grouped into per-source
    * streams. It receives events from EventsTracker, and passes
@@ skipping 71 matching lines @@
       // List source entries with new log entries.  Sorted chronologically, by
       // first new log entry.
       var updatedSourceEntries = [];
 
       var updatedSourceEntryIdMap = {};
 
       for (var e = 0; e < logEntries.length; ++e) {
         var logEntry = logEntries[e];
 
         // Assign unique ID, if needed.
+        // TODO(mmenke):  Remove this, and all other code to handle 0 source
+        //                IDs when M19 hits stable.
         if (logEntry.source.id == 0) {
           logEntry.source.id = this.nextSourcelessEventId_;
           --this.nextSourcelessEventId_;
         } else if (this.maxReceivedSourceId_ < logEntry.source.id) {
           this.maxReceivedSourceId_ = logEntry.source.id;
         }
 
         // Create/update SourceEntry object.
         var sourceEntry = this.sourceEntries_[logEntry.source.id];
         if (!sourceEntry) {
@@ skipping 55 matching lines @@
      *   ovserver.onAllSourceEntriesDeleted()
      *   observer.onSecurityStrippingChanged()
      */
     addSourceEntryObserver: function(observer) {
       this.sourceEntryObservers_.push(observer);
     }
   };
 
   return SourceTracker;
 })();