Added common layout framework for system menu rows.

ui/views/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/ozone/ozone.gni")
 
 config("flags") {
@@ skipping 667 matching lines @@
     "test/menu_runner_test_api.cc",
     "test/menu_runner_test_api.h",
     "test/menu_test_utils.cc",
     "test/menu_test_utils.h",
     "test/native_widget_factory.cc",
     "test/native_widget_factory.h",
     "test/scoped_views_test_helper.cc",
     "test/scoped_views_test_helper.h",
     "test/slider_test_api.cc",
     "test/slider_test_api.h",
+    "test/test_layout_manager.cc",
+    "test/test_layout_manager.h",
     "test/test_slider.cc",
     "test/test_slider.h",
     "test/test_views.cc",
     "test/test_views.h",
     "test/test_views_delegate.h",
     "test/test_views_delegate_mac.mm",
     "test/test_widget_observer.cc",
     "test/test_widget_observer.h",
     "test/views_test_base.cc",
     "test/views_test_base.h",
@@ skipping 314 matching lines @@
       "//ui/base:test_support",
       "//ui/compositor",
       "//ui/events:test_support",
       "//ui/gl:test_support",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/strings",
     ]
   }
 }