Avoid unnecessary visibility changes to BookmarkBarView

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'variables': {
     'chrome_browser_ui_non_ios_sources': [
       'browser/ui/accelerator_utils.h',
       'browser/ui/android/android_about_app_info.cc',
       'browser/ui/android/android_about_app_info.h',
@@ skipping 1889 matching lines @@
       'browser/ui/views/autofill/password_generation_popup_view_views.cc',
       'browser/ui/views/autofill/password_generation_popup_view_views.h',
       'browser/ui/views/autofill/tooltip_icon.cc',
       'browser/ui/views/autofill/tooltip_icon.h',
       'browser/ui/views/auto_keep_alive.cc',
       'browser/ui/views/auto_keep_alive.h',
       'browser/ui/views/bookmarks/bookmark_bar_instructions_view.cc',
       'browser/ui/views/bookmarks/bookmark_bar_instructions_view.h',
       'browser/ui/views/bookmarks/bookmark_bar_view.cc',
       'browser/ui/views/bookmarks/bookmark_bar_view.h',
+      'browser/ui/views/bookmarks/bookmark_bar_view_observer.h',
       'browser/ui/views/bookmarks/bookmark_bubble_view.cc',
       'browser/ui/views/bookmarks/bookmark_bubble_view.h',
       'browser/ui/views/bookmarks/bookmark_bubble_view_observer.h',
       'browser/ui/views/bookmarks/bookmark_context_menu.cc',
       'browser/ui/views/bookmarks/bookmark_context_menu.h',
       'browser/ui/views/bookmarks/bookmark_drag_drop_views.cc',
       'browser/ui/views/bookmarks/bookmark_drag_drop_views.h',
       'browser/ui/views/bookmarks/bookmark_editor_view.cc',
       'browser/ui/views/bookmarks/bookmark_editor_view.h',
       'browser/ui/views/bookmarks/bookmark_menu_controller_observer.h',
@@ skipping 1053 matching lines @@
         }],
         ['OS!="android" and OS!="ios"', {
           'dependencies': [
             '../device/bluetooth/bluetooth.gyp:device_bluetooth',
           ],
         }],
       ],
     },
   ],
 }