Reverse bookmark buttons and menus in RTL

chrome/browser/ui/cocoa/l10n_util.mm

Index: chrome/browser/ui/cocoa/l10n_util.mm
diff --git a/chrome/browser/ui/cocoa/l10n_util.mm b/chrome/browser/ui/cocoa/l10n_util.mm
index 73db01d423dc3cc07cc90f4444bb793e6e918b41..49f47c7fcb92cf88e0368d880306b98dd5478aa6 100644
--- a/chrome/browser/ui/cocoa/l10n_util.mm
+++ b/chrome/browser/ui/cocoa/l10n_util.mm
@@ -96,4 +96,47 @@ bool ShouldFlipWindowControlsInRTL() {
   return ShouldDoExperimentalRTLLayout() && base::mac::IsAtLeastOS10_12();
 }
 
+#if !defined(MAC_OS_X_VERSION_10_12) || \
+    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12
+NSCellImagePosition LeadingCellImagePosition() {
+  return ShouldDoExperimentalRTLLayout() ? NSImageRight : NSImageLeft;
+}
+NSCellImagePosition TrailingCellImagePosition() {
+  return ShouldDoExperimentalRTLLayout() ? NSImageLeft : NSImageRight;
+}
+#else
+NSCellImagePosition LeadingCellImagePosition() {
+  return NSImageLeading;
+}
+NSCellImagePosition TrailingCellImagePosition() {
+  return NSImageTrailing;
+}
+#endif  // MAC_OS_X_VERSION_10_12
+
+// Adapted from Apple's RTL docs (goo.gl/cBaFnT)
+NSImage* FlippedImage(NSImage* image) {
+  NSImage* existingImage = image;
+  NSSize existingSize = [existingImage size];
+  NSSize newSize = NSMakeSize(existingSize.width, existingSize.height);
+  NSImage* flippedImage = [[[NSImage alloc] initWithSize:newSize] autorelease];
+
+  [flippedImage lockFocus];
+  [[NSGraphicsContext currentContext]
+      setImageInterpolation:NSImageInterpolationHigh];
+
+  NSAffineTransform* transform = [NSAffineTransform transform];
+  [transform translateXBy:existingSize.width yBy:0];
+  [transform scaleXBy:-1 yBy:1];
+  [transform concat];
+
+  [existingImage drawAtPoint:NSZeroPoint
+                    fromRect:NSMakeRect(0, 0, newSize.width, newSize.height)
+                   operation:NSCompositeSourceOver
+                    fraction:1.0];
+
+  [flippedImage unlockFocus];
+
+  return flippedImage;
+}
+
 }  // namespace cocoa_l10n_util