Create vector icon directory for resources used by controls in ui/views.

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 d2ca6efe25d6e102c07bb72010588802f0a24c49..4b77a25f68a9d5c1955d360b4d2c096deef30948 100644
--- a/ui/views/controls/button/checkbox.h
+++ b/ui/views/controls/button/checkbox.h
@@ -15,7 +15,7 @@
 class SkPaint;
 
 namespace gfx {
-enum class VectorIconId;
+struct VectorIcon;
 }
 
 namespace views {
@@ -63,9 +63,8 @@ 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;
+  // Gets the vector icon to use based on the current state of |checked_|.
+  virtual const gfx::VectorIcon& GetVectorIcon() const;
 
  private:
   // Overridden from Button: