Harmony checkbox/radio tweaks

ui/views/controls/button/checkbox.h

Index: ui/views/controls/button/checkbox.h
diff --git a/ui/views/controls/button/checkbox.h b/ui/views/controls/button/checkbox.h
index 654039463623970ae54d1f3bac7182a00642009a..9c03ae6d7f957ad731fb1fe089f74e8a70a88d8c 100644
--- a/ui/views/controls/button/checkbox.h
+++ b/ui/views/controls/button/checkbox.h
@@ -14,6 +14,10 @@
 
 class SkPaint;
 
+namespace gfx {
+enum class VectorIconId;
+}
+
 namespace views {
 
 class InkDropHover;
@@ -63,6 +67,10 @@ class VIEWS_EXPORT Checkbox : public LabelButton {
   // Paints a focus indicator for the view.
   virtual void PaintFocusRing(gfx::Canvas* canvas, const SkPaint& paint);
 
+  // Gets the vector icon id used to draw the icon based on the current state of
+  // |checked_|.
+  virtual gfx::VectorIconId GetVectorIconId() const;
+
  private:
   // Overridden from Button:
   void NotifyClick(const ui::Event& event) override;