MacViews: Use Cocoa folder icons in tree views.

ui/gfx/skbitmap_operations.h

Index: ui/gfx/skbitmap_operations.h
diff --git a/ui/gfx/skbitmap_operations.h b/ui/gfx/skbitmap_operations.h
index 0850188f0b857a5596ae85c4994968e5ab94fbca..3ac47449dd420f9451846606051365b815f36cac 100644
--- a/ui/gfx/skbitmap_operations.h
+++ b/ui/gfx/skbitmap_operations.h
@@ -100,6 +100,9 @@ class GFX_EXPORT SkBitmapOperations {
   // Transpose the pixels in |bitmap| by swapping x and y.
   static SkBitmap CreateTransposedBitmap(const SkBitmap& bitmap);
 
+  // Mirror the pixels in |bitmap|.
+  static SkBitmap CreateMirroredBitmap(const SkBitmap& bitmap);
+
   // Create a bitmap by combining alpha channel of |bitmap| and color |c|.
   // The image must use the kARGB_8888_Config config.
   static SkBitmap CreateColorMask(const SkBitmap& bitmap, SkColor c);