Dynamically calculate the number of extension icons to show per row in overflow

ui/views/views.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
     # Sources lists shared with GN build.
     'views_sources': [
       'accessibility/native_view_accessibility.cc',
       'accessibility/native_view_accessibility.h',
@@ skipping 489 matching lines @@
       'bubble/bubble_window_targeter_unittest.cc',
       'cocoa/bridged_native_widget_unittest.mm',
       'controls/button/blue_button_unittest.cc',
       'controls/button/custom_button_unittest.cc',
       'controls/button/image_button_unittest.cc',
       'controls/button/label_button_unittest.cc',
       'controls/button/menu_button_unittest.cc',
       'controls/combobox/combobox_unittest.cc',
       'controls/label_unittest.cc',
       'controls/menu/menu_controller_unittest.cc',
+      'controls/menu/menu_item_view_unittest.cc',
       'controls/menu/menu_model_adapter_unittest.cc',
       'controls/menu/menu_runner_cocoa_unittest.mm',
       'controls/native/native_view_host_aura_unittest.cc',
       'controls/native/native_view_host_unittest.cc',
       'controls/prefix_selector_unittest.cc',
       'controls/progress_bar_unittest.cc',
       'controls/scrollbar/scrollbar_unittest.cc',
       'controls/scroll_view_unittest.cc',
       'controls/single_split_view_unittest.cc',
       'controls/slider_unittest.cc',
@@ skipping 354 matching lines @@
                 '../aura/aura.gyp:aura',
                 '../wm/wm.gyp:wm',
               ],
             }],
           ],
         },  # target_name: macviews_interactive_ui_tests
       ],  # targets
     }],
   ],  # conditions
 }