MacViews: Overlay Scrollbars with Show/Hide Animations

ui/views/style/platform_style.h

Index: ui/views/style/platform_style.h
diff --git a/ui/views/style/platform_style.h b/ui/views/style/platform_style.h
index e56fe0e30ba41263550095c37f381c195b0cf850..1f7b9a253ca2ec997f6983d554b81acd9294f93d 100644
--- a/ui/views/style/platform_style.h
+++ b/ui/views/style/platform_style.h
@@ -14,6 +14,7 @@ namespace views {
 class Border;
 class LabelButton;
 class LabelButtonBorder;
+class ScrollBar;
 
 // Cross-platform API for providing platform-specific styling for toolkit-views.
 class PlatformStyle {
@@ -26,6 +27,9 @@ class PlatformStyle {
   // Applies the current system theme to the default border created by |button|.
   static scoped_ptr<Border> CreateThemedLabelButtonBorder(LabelButton* button);
 
+  // Creates the default scrollbar for the given orientation.
+  static scoped_ptr<ScrollBar> CreateScrollBar(bool is_horizontal);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformStyle);
 };