views: add focus ring to TreeView

ui/views/controls/focus_ring.h

Index: ui/views/controls/focus_ring.h
diff --git a/ui/views/controls/focus_ring.h b/ui/views/controls/focus_ring.h
index 2438bc7b9dd5f215359deddab148669cc2f798a6..181858ff521217d55ff255e5a9a921e8eddfbdae 100644
--- a/ui/views/controls/focus_ring.h
+++ b/ui/views/controls/focus_ring.h
@@ -14,6 +14,11 @@ namespace views {
 // the bounds of its parent view.
 class FocusRing : public View {
  public:
+  static const char kViewClassName[];
+
+  FocusRing();

[sky, 2016/10/12 23:58:01]

Move definition to match new position (style guide says declaration and
definition orders should match).

[Elly Fong-Jones, 2016/10/13 11:14:56]

Done.

+  ~FocusRing() override;
+
   // Create a FocusRing and adds it to |parent|.
   static void Install(views::View* parent);
 
@@ -27,10 +32,6 @@ class FocusRing : public View {
   void OnPaint(gfx::Canvas* canvas) override;
 
  private:
-  static const char kViewClassName[];
-
-  FocusRing();
-  ~FocusRing() override;
 
   DISALLOW_COPY_AND_ASSIGN(FocusRing);
 };