MacViews: Implement scrollbar theming.

ui/native_theme/native_theme_mac.h

Index: ui/native_theme/native_theme_mac.h
diff --git a/ui/native_theme/native_theme_mac.h b/ui/native_theme/native_theme_mac.h
index 0b15b3f50950e263e16257ae81c28f8fd1fc341b..c184812a000d4b8df7c4460169f9da68a1676008 100644
--- a/ui/native_theme/native_theme_mac.h
+++ b/ui/native_theme/native_theme_mac.h
@@ -29,6 +29,16 @@ class NativeThemeMac : public FallbackTheme {
       State state,
       const gfx::Rect& rect,
       const MenuListExtraParams& menu_list) const OVERRIDE;
+  virtual void PaintScrollbarTrack(

[tapted, 2014/08/11 01:00:58]

Nit: place these above the PaintMenu* functions, to match declaration order in
the base class

[Andre, 2014/08/12 21:42:37]

Done.

+      SkCanvas* canvas,
+      Part part,
+      State state,
+      const ScrollbarTrackExtraParams& extra_params,
+      const gfx::Rect& rect) const OVERRIDE;
+  virtual void PaintScrollbarThumb(SkCanvas* sk_canvas,
+                                   Part part,
+                                   State state,
+                                   const gfx::Rect& rect) const OVERRIDE;
 
  private:
   NativeThemeMac();