Changes BookmarkBarView to only create buttons as needed

chrome/chrome_tests.gypi

 # Copyright 2013 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_extensions_test_support_sources': [
       # A list of sources which is shared between different browser tests.
       'browser/apps/app_browsertest_util.cc',
       'browser/apps/app_browsertest_util.h',
       'browser/extensions/browsertest_util.cc',
@@ skipping 1398 matching lines @@
             '../ash/drag_drop/drag_drop_interactive_uitest.cc',
             '../ash/wm/ash_native_cursor_manager_interactive_uitest.cc',
             'browser/ui/window_sizer/window_sizer_ash_uitest.cc',
           ],
         }],
         ['OS=="mac"', {
           'sources!': [
             # TODO(tapted): Enable toolkit-views tests on Mac when their
             # respective implementations are ported.
             'browser/ui/views/bookmarks/bookmark_bar_view_test.cc',
+            'browser/ui/views/bookmarks/bookmark_bar_view_test_helper.h',
             'browser/ui/views/constrained_window_views_browsertest.cc',
             'browser/ui/views/find_bar_host_interactive_uitest.cc',
             'browser/ui/views/keyboard_access_browsertest.cc',
             'browser/ui/views/location_bar/location_icon_view_interactive_uitest.cc',
             'browser/ui/views/location_bar/star_view_browsertest.cc',
             'browser/ui/views/message_center/web_notification_tray_browsertest.cc',
             'browser/ui/views/omnibox/omnibox_view_views_browsertest.cc',
             'browser/ui/views/panels/panel_view_browsertest.cc',
             'browser/ui/views/passwords/manage_passwords_bubble_view_browsertest.cc',
             'browser/ui/views/ssl_client_certificate_selector_browsertest.cc',
@@ skipping 1739 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }