Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/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/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 3403 matching lines @@
 
 # In GYP this is part of test_support_common.
 static_library("test_support") {
   testonly = true
 
   sources = [
     "cocoa/test/cocoa_test_helper.h",
     "cocoa/test/cocoa_test_helper.mm",
     "cocoa/test/run_loop_testing.h",
     "cocoa/test/run_loop_testing.mm",
+    "cocoa/test/scoped_force_rtl_mac.h",
+    "cocoa/test/scoped_force_rtl_mac.mm",
     "find_bar/find_bar_host_unittest_util.h",
     "login/login_handler_test_utils.cc",
     "login/login_handler_test_utils.h",
     "toolbar/test_toolbar_action_view_controller.cc",
     "toolbar/test_toolbar_action_view_controller.h",
   ]
   public_deps = [
     ":ui",
   ]
   deps = [
@@ skipping 47 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }