Implement the onBeforeRetarget event of the webNavigation API

chrome/common/notification_type.h

 // Copyright (c) 2011 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_
 #pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
@@ skipping 131 matching lines @@
     // request was issued.  Details in the form of a ResourceRequestDetails
     // object are provided.
     RESOURCE_RESPONSE_STARTED,
 
     // A redirect was received while requesting a resource.  The source will be
     // a Source<RenderViewHostDelegate> corresponding to the tab in which the
     // request was issued.  Details in the form of a ResourceRedirectDetails
     // are provided.
     RESOURCE_RECEIVED_REDIRECT,
 
+    // A new window is created in response to a request from a renderer. The
+    // source will be a Source<TabContents> corresponding to the tab the
+    // request originates from.  Details in the form of a
+    // ViewHostMsg_CreateWindow_Params object are provided.
+    CREATING_NEW_WINDOW,
+
     // SSL ---------------------------------------------------------------------
 
     // Updating the SSL security indicators (the lock icon and such) proceeds
     // in two phases:
     //
     // 1) The internal SSL state for a host or tab changes.  When this happens,
     //    the SSLManager broadcasts an SSL_INTERNAL_STATE_CHANGED notification.
     //
     // 2) The SSLManager for each tab receives this notification and might or
     //    might not update the navigation entry for its tab, depending on
@@ skipping 1171 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_