override chrome:// URLs via extensions.

chrome/common/notification_type.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef CHROME_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 613 matching lines @@
     EXTENSION_UNLOADED_DISABLED,
 
     // Sent after a new ExtensionHost is created. The details are
     // an ExtensionHost* and the source is an ExtensionProcessManager*.
     EXTENSION_HOST_CREATED,
 
     // Sent before an ExtensionHost is destroyed. The details are
     // an ExtensionHost* and the source is a Profile*.
     EXTENSION_HOST_DESTROYED,
 
+    // Send by an ExtensionHost when it finished its initial page load.
+    // The details are an ExtensionHost* and the source is a Profile*.
+    EXTENSION_HOST_DID_STOP_LOADING,
+
     // Sent after an extension render process is created and fully functional.
     // The details are an ExtensionHost*.
     EXTENSION_PROCESS_CREATED,
 
     // Sent when extension render process crashes. The details are
     // an ExtensionHost* and the source is an ExtensionsService*.
     EXTENSION_PROCESS_CRASHED,
 
     // Sent when the contents or order of toolstrips in the shelf model change.
     EXTENSION_SHELF_MODEL_CHANGED,
@@ skipping 32 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_