[Mac] Mirror bookmark bubble folder dropdown in RTL

chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
index 4375e5b96902fff2e02fc71d55a1082ec20ee2e3..b37dd7d714b67c796920f14e0a35c8020bcba3fd 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
@@ -329,6 +329,11 @@ using bookmarks::BookmarkNode;
   cocoa_l10n_util::FlipAllSubviewsIfNecessary([nameTextField_ superview]);
   // Relative order of the done and options buttons.
   cocoa_l10n_util::FlipAllSubviewsIfNecessary(trailingButtonContainer_);
+  if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout()) {
+    [folderPopUpButton_ setUserInterfaceLayoutDirection:
+                            NSUserInterfaceLayoutDirectionRightToLeft];
+    [folderPopUpButton_ setAlignment:NSNaturalTextAlignment];

[Sidney San Martín, 2017/06/01 18:52:19]

nit: It looks like this is only needed because folderPopUpButton_ comes from a
nib. Could you add a comment about that?

[lgrey, 2017/06/02 16:10:18]

Done.

+  }
 }
 
 @end  // BookmarkBubbleController