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

chrome/browser/ui/cocoa/l10n_util.h

Index: chrome/browser/ui/cocoa/l10n_util.h
diff --git a/chrome/browser/ui/cocoa/l10n_util.h b/chrome/browser/ui/cocoa/l10n_util.h
index 7e6175c13c4f4cf9adf64776a699b07fd69e1b6e..a11318f3252646813d802a55851bba6b8adf687c 100644
--- a/chrome/browser/ui/cocoa/l10n_util.h
+++ b/chrome/browser/ui/cocoa/l10n_util.h
@@ -52,6 +52,13 @@ bool ShouldDoExperimentalRTLLayout();
 // OSes would make Chrome stick out.
 bool ShouldFlipWindowControlsInRTL();
 
+// Returns NSImageLeading when available (10.12+), otherwise
+// NSImageLeft for LTR and NSImageRight in RTL.
+NSCellImagePosition LeadingCellImagePosition();
+// Returns NSImageTrailing when available (10.12+), otherwise
+// NSImageRight for LTR and NSImageLeft in RTL.
+NSCellImagePosition TrailingCellImagePosition();
+
 // Returns an autoreleased image containing |image| flipped
 // across the x axis.
 NSImage* FlippedImage(NSImage* image);