Here's a screenshot showing ellipsis issues in RTL mode. I mentioned in https://codereview.chromium.org/2511973002/ that there are layout problems in LTR mode but I'm not seeing them now (before I was running with my default user-data-dir - this screenshot was taken using an empty user-data-dir).

This is Chromium 57.0.2925.0.

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e85d0513cdbaeeff936cc30f1d73ae9887d1df43

commit e85d0513cdbaeeff936cc30f1d73ae9887d1df43
Author: lgrey <lgrey@chromium.org>
Date: Wed May 03 22:07:57 2017

[Mac] Reverse bookmark buttons and menus in RTL (take 2)

LTR image diffs show this as:
- Identical to HEAD in retina
- In non-retina, some bookmarks at the width limit show an additional character vs. HEAD. I think this is more true to the spec and is closer to Views (though it's hard to compare directly since views fades instead of cutting off with an ellipsis)

This is a semi-manual rebase of
https://codereview.chromium.org/2511973002/

BUG= 648561 ,  648560 

Review-Url: https://codereview.chromium.org/2845003003
Cr-Commit-Position: refs/heads/master@{#469157}

[modify] https://crrev.com/e85d0513cdbaeeff936cc30f1d73ae9887d1df43/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm
[modify] https://crrev.com/e85d0513cdbaeeff936cc30f1d73ae9887d1df43/chrome/browser/ui/cocoa/bookmarks/bookmark_button_cell.mm
[modify] https://crrev.com/e85d0513cdbaeeff936cc30f1d73ae9887d1df43/chrome/browser/ui/cocoa/bookmarks/bookmark_button_cell_unittest.mm
[modify] https://crrev.com/e85d0513cdbaeeff936cc30f1d73ae9887d1df43/chrome/browser/ui/cocoa/gradient_button_cell.h
[modify] https://crrev.com/e85d0513cdbaeeff936cc30f1d73ae9887d1df43/chrome/browser/ui/cocoa/gradient_button_cell.mm
[modify] https://crrev.com/e85d0513cdbaeeff936cc30f1d73ae9887d1df43/chrome/browser/ui/cocoa/l10n_util.h
[modify] https://crrev.com/e85d0513cdbaeeff936cc30f1d73ae9887d1df43/chrome/browser/ui/cocoa/l10n_util.mm

This is not a localization bug. Can't confirm that it's still relevant to the current English UI

lgrey@: Please confirm on how to enable Mac rtl behavior as mac-rtl flag doesn't have any effect.

ajha@ along with enabling the MacRTL feature you need to either:
- set your language to Arabic or Hebrew and reboot (or log out of macOS and back in) or
- launch with -NSForceRightToLeftWritingDirection YES -AppleTextDirection YES --force-ui-direction=rtl

Thanks Igrey@ for the updated steps. This looks to be WAI as per the behavior mentioned in C#0. Attached is the screenshot of the same.

lgrey@: Could you please confirm if there is still WIP for this.

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Not actively, but as a general rule, I'm not marking Proj-MacRTL bugs fixed until we're shipping them to at least some percentage of users (which we don't plan to do until everything is done.)