[Mac] Don't flip window controls in RTL for macOS < 10.12

chrome/browser/ui/cocoa/l10n_util.mm

 // Copyright (c) 2010 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 "chrome/browser/ui/cocoa/l10n_util.h"
 
 #include "base/i18n/rtl.h"
+#include "base/mac/mac_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMUILocalizerAndLayoutTweaker.h"
 
 namespace cocoa_l10n_util {
 
 NSInteger CompareFrameY(id view1, id view2, void* context) {
   CGFloat y1 = NSMinY([view1 frame]);
   CGFloat y2 = NSMinY([view2 frame]);
   if (y1 < y2)
@@ skipping 66 matching lines @@
 }
 
 const base::Feature kExperimentalMacRTL{"ExperimentalMacRTL",
                                         base::FEATURE_DISABLED_BY_DEFAULT};
 
 bool ShouldDoExperimentalRTLLayout() {
   return base::i18n::IsRTL() &&
          base::FeatureList::IsEnabled(kExperimentalMacRTL);
 }
 
+bool ShouldFlipWindowControlsInRTL() {
+  return ShouldDoExperimentalRTLLayout() && base::mac::IsAtLeastOS10_12();
+}
+
 }  // namespace cocoa_l10n_util