Make about:net-internal's filters work a bit better.

chrome/browser/resources/net_internals/events_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.
 
 /**
  * EventsView displays a filtered list of all events sharing a source, and
  * a details pane for the selected sources.
  *
  *  +----------------------++----------------+
  *  |      filter box      ||                |
@@ skipping 267 matching lines @@
      * Returns |filterText| with all recognized directives removed.
      */
     parseStringDirectives_: function(filterText, filter) {
       var directives = ['type', 'id'];
       for (var i = 0; i < directives.length; ++i) {
         while (true) {
           var directive = directives[i];
           var filterInfo = this.parseDirective_(filterText, directive);
           if (filterInfo == null)
             break;
-          if (!filter[directive])
-            filter[directive] = [];
-          filter[directive].push(filterInfo.parameter);
+
+          // Split parameters around commas and remove empty elements.
+          var parameters = filterInfo.parameter.split(',');
+          parameters = parameters.filter(function(string) {
+              return string.length > 0;
+          });
+
+          // If there's already a matching filter, take the intersection.
+          // This behavior primarily exists for tests.  It is not correct
+          // when one of the 'type' filters is a partial match.
+          if (filter[directive]) {
+            parameters = parameters.filter(function(string) {
+                return filter[directive].indexOf(string) != -1;
+            });
+          }
+
+          filter[directive] = parameters;
           filterText = filterInfo.remainingText;
         }
       }
       return filterText;
     },
 
     /*
      * Converts |filterText| into an object representing the filter.
      */
     createFilter_: function(filterText) {
@@ skipping 374 matching lines @@
     var source1Text = source1.getSourceTypeString();
     var source2Text = source2.getSourceTypeString();
     var compareResult = source1Text.localeCompare(source2Text);
     if (compareResult != 0)
       return compareResult;
     return compareSourceId(source1, source2);
   }
 
   return EventsView;
 })();