Add ScopedMacRTL class for Cocoa browser RTL testing

ui/base/test/scoped_mac_rtl.h

+// Copyright 2016 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.
+
+#ifndef BASE_TEST_SCOPED_MAC_RTL_H_
+#define BASE_TEST_SCOPED_MAC_RTL_H_
+
+#import <Cocoa/Cocoa.h>

[Robert Sesek, 2016/12/07 16:09:59]

Move this into the .mm file so that this file can be included from C++ (if
necessary), since it's unused in the header.

+#include <string>
+
+#include "base/test/scoped_feature_list.h"
+
+namespace cocoa_rtl_util {

[Robert Sesek, 2016/12/07 16:09:59]

namespace ui

+
+// Enables all flags required for
+// |cocoa_rtl_util::ShouldDoExperimentalRTLLayout|
+// to return true.
+class ScopedMacRTL final {

[Robert Sesek, 2016/12/07 16:09:59]

ScopedEnableMacRTLLayout ?

+ public:
+  ScopedMacRTL();
+  ~ScopedMacRTL();
+
+ private:
+  BOOL original_apple_text_direction_;
+  BOOL original_rtl_writing_direction_;
+  std::string original_locale_;
+  base::test::ScopedFeatureList scoped_feature_list_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedMacRTL);
+};
+
+}  // namespace cocoa_rtl_util
+
+#endif  // BASE_TEST_SCOPED_MAC_RTL_H_