Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/cocoa/test/scoped_force_rtl_mac.h

Index: chrome/browser/ui/cocoa/test/scoped_force_rtl_mac.h
diff --git a/chrome/browser/ui/cocoa/test/scoped_force_rtl_mac.h b/chrome/browser/ui/cocoa/test/scoped_force_rtl_mac.h
new file mode 100644
index 0000000000000000000000000000000000000000..827304a209f2c19f01165c7da8824cb2972622ba
--- /dev/null
+++ b/chrome/browser/ui/cocoa/test/scoped_force_rtl_mac.h
@@ -0,0 +1,31 @@
+// 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 CHROME_BROWSER_UI_COCOA__TEST_SCOPED_FORCE_RTL_MAC_H__

[tapted, 2016/12/12 22:20:38]

nit: remove an extra underscore in COCOA__TEST (3 places)

[lgrey, 2016/12/12 22:38:20]

Done.

+#define CHROME_BROWSER_UI_COCOA__TEST_SCOPED_FORCE_RTL_MAC_H__
+
+#include <string>
+
+#include "base/test/scoped_feature_list.h"
+
+namespace cocoa_l10n_util {
+
+// Enables all flags required for
+// |cocoa_l10n_util::ShouldDoExperimentalRTLLayout| to return true.
+class ScopedForceRTLMac final {
+ public:
+  ScopedForceRTLMac();
+  ~ScopedForceRTLMac();
+
+ 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(ScopedForceRTLMac);

[tapted, 2016/12/12 22:20:38]

nit: blank line before

[lgrey, 2016/12/12 22:38:20]

Done.

+};
+
+}  // namespace cocoa_l10n_util
+
+#endif  // CHROME_BROWSER_UI_COCOA__TEST_SCOPED_FORCE_RTL_MAC_H__