Implement page action popups.

chrome/common/notification_type.h

 // Copyright (c) 2009 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 689 matching lines @@
     // Sent when the contents or order of toolstrips in the shelf model change.
     EXTENSION_SHELF_MODEL_CHANGED,
 
     // Sent when a background page is ready so other components can load.
     EXTENSION_BACKGROUND_PAGE_READY,
 
     // Sent when a browser action's state has changed. The source is the
     // ExtensionAction* that changed. The details are an ExtensionActionState*.
     EXTENSION_BROWSER_ACTION_UPDATED,
 
+    // Sent when a page action's visibility has changed. The source is the
+    // ExtensionAction* that changed. The details are a TabContents*.
+    EXTENSION_PAGE_ACTION_VISIBILITY_CHANGED,
+
     // Sent by an extension to notify the browser about the results of a unit
     // test.
     EXTENSION_TEST_PASSED,
     EXTENSION_TEST_FAILED,
 
     // Sent when an bookmarks extensions API function was successfully invoked.
     // The source is the id of the extension that invoked the function, and the
     // details are a pointer to the const BookmarksFunction in question.
     EXTENSION_BOOKMARKS_API_INVOKED,
 
@@ skipping 53 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_