JavaScript to Value bridge.

chrome/common/notification_type.h

 // Copyright (c) 2010 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 492 matching lines @@
 
     // The focused element inside a page has changed.  The source is the render
     // view host for the page, there are no details.
     FOCUS_CHANGED_IN_PAGE,
 
     // Notification posted from ExecuteJavascriptInWebFrameNotifyResult. The
     // source is the RenderViewHost ExecuteJavascriptInWebFrameNotifyResult was
     // invoked on. The details are a std::pair<int, Value*> with the int giving
     // the id returned from ExecuteJavascriptInWebFrameNotifyResult and the
     // Value the results of the javascript expression. The Value is owned by
-    // RenderViewHost.
+    // RenderViewHost and may be a Null Value.
     EXECUTE_JAVASCRIPT_RESULT,
 
     // BackgroundContents ------------------------------------------------------
 
     // A new background contents was opened by script. The source is the parent
     // profile and the details are BackgroundContentsOpenedDetails.
     BACKGROUND_CONTENTS_OPENED,
 
     // The background contents navigated to a new location. The source is the
     // parent Profile, and the details are the BackgroundContents that was
@@ skipping 794 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_