Give the ChromeVox Panel an extension view type.

chrome/common/extensions/api/developer_private.idl

 // 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.
 
 // developerPrivate API.
 // This is a private API exposing developing and debugging functionalities for
 // apps and extensions.
 namespace developerPrivate {
 
   // DEPRECATED: Prefer ExtensionType.
@@ skipping 44 matching lines @@
     FROM_STORE,
     UNPACKED,
     THIRD_PARTY,
     // "Unknown" includes crx's installed from chrome://extensions.
     UNKNOWN
   };
 
   enum ViewType {
     APP_WINDOW,
     BACKGROUND_CONTENTS,
+    COMPONENT,
     EXTENSION_BACKGROUND_PAGE,
     EXTENSION_DIALOG,
     EXTENSION_GUEST,
     EXTENSION_POPUP,
     LAUNCHER_PAGE,
     PANEL,
-    TAB_CONTENTS,
-    VIRTUAL_KEYBOARD
+    TAB_CONTENTS
   };
 
   enum ErrorType {
     MANIFEST,
     RUNTIME
   };
 
   enum ErrorLevel {
     LOG,
     WARN,
@@ skipping 500 matching lines @@
 
   interface Events {
     // Fired when a item state is changed.
     static void onItemStateChanged(EventData response);
 
     // Fired when the profile's state has changed.
     static void onProfileStateChanged(ProfileInfo info);
   };
 
 };