keyboard: Update the visibility after tab-switch.

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 501 matching lines @@
     // is the ExtensionInstallUI, the details are NoDetails.
     EXTENSION_WILL_SHOW_CONFIRM_DIALOG,
 
     // Used to monitor web cache usage by notifying whenever the
     // CacheManagerHost observes new UsageStats. The source will be the
     // RenderProcessHost that corresponds to the new statistics. Details are a
     // UsageStats object sent by the renderer, and should be copied - ptr not
     // guaranteed to be valid after the notification.
     WEB_CACHE_STATS_OBSERVED,
 
-    // The focused element inside a page has changed.  The source is the render
-    // view host for the page.  The details are a Details<const bool> that
-    // indicates whether or not an editable node was focused.
+    // The focused element inside a page has changed.  The source is the
+    // TabContents containing the render view host for the page. The details is
+    // a Details<const bool> that indicates whether or not an editable node was
+    // focused.
     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 and may be a Null Value.
     EXECUTE_JAVASCRIPT_RESULT,
 
@@ skipping 793 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_