Refactor MdFocusRing to make it easier to reuse on other controls.

ui/views/examples/button_sticker_sheet.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/examples/button_sticker_sheet.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/button/md_text_button.h"
@@ skipping 98 matching lines @@
   MakeButtonsInState(&primary, &secondary, this, Button::STATE_NORMAL);
   AddLabelledRowToGridLayout(layout, "Default", {primary, secondary});
   MakeButtonsInState(&primary, &secondary, this, Button::STATE_NORMAL);
   AddLabelledRowToGridLayout(layout, "Normal", {primary, secondary});
   MakeButtonsInState(&primary, &secondary, this, Button::STATE_HOVERED);
   AddLabelledRowToGridLayout(layout, "Hovered", {primary, secondary});
   MakeButtonsInState(&primary, &secondary, this, Button::STATE_PRESSED);
   AddLabelledRowToGridLayout(layout, "Pressed", {primary, secondary});
   MakeButtonsInState(&primary, &secondary, this, Button::STATE_DISABLED);
   AddLabelledRowToGridLayout(layout, "Disabled", {primary, secondary});
-
-  MakeButtonsInState(&primary, &secondary, this, Button::STATE_NORMAL);
-  primary->OnFocus();
-  secondary->OnFocus();
-  AddLabelledRowToGridLayout(layout, "Focused", {primary, secondary});
 }
 
 void ButtonStickerSheet::ButtonPressed(Button* button, const ui::Event& event) {
   // Ignore button presses.
 }
 
 }  // namespace examples
 }  // namespace views