mac rtl: pin profile switcher to left edge in rtl

chrome/browser/ui/cocoa/l10n_util.h

 // 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 <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include "base/strings/string16.h"
 
 namespace cocoa_l10n_util {
@@ skipping 15 matching lines @@
 
 // Like |base::ReplaceStringPlaceholders(const base::string16&,
 // const base::string16&, size_t*)|, but for a NSString formatString.
 NSString* ReplaceNSStringPlaceholders(NSString* formatString,
                                       const base::string16& a,
                                       size_t* offset);
 
 // Generates a tooltip string for a given URL and title.
 NSString* TooltipForURLAndTitle(NSString* url, NSString* title);
 
-// Returns whether experimental Mac RTL support is enabled via
-// --enable-features=ExperimentalMacRTL.
+// Returns whether both:
+// 1) Experimental Mac RTL support is enabled via the ExperimentalMacRTL
+//    feature;
+// 2) The browser UI is in RTL mode.

[Mark Mentovai, 2016/09/15 13:46:11]

The name of the function doesn’t indicate that it does this, so when you read
the code at the call sites, it looks like this aspect is unchecked. IS there a
better name that you can use for the function?

[Elly Fong-Jones, 2016/09/16 12:56:45]

Renamed it to ShouldDoExperimentalRTLLayout.

+// If ExperimentalMacRTL becomes the default, this function can be replaced with
+// uses of base::i18n::IsRTL().
 bool ExperimentalMacRTLIsEnabled();
 
 }  // namespace cocoa_l10n_util