MacViews: Overlay Scrollbars with Show/Hide Animations

ui/views/controls/scrollbar/native_scroll_bar.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 18 matching lines @@
   static const char kViewClassName[];
 
   // Create new scrollbar, either horizontal or vertical.
   explicit NativeScrollBar(bool is_horiz);
   ~NativeScrollBar() override;
 
   // Return the system sizes.
   static int GetHorizontalScrollBarHeight(const ui::NativeTheme* theme);
   static int GetVerticalScrollBarWidth(const ui::NativeTheme* theme);
 
+ protected:
+  virtual NativeScrollBarWrapper* CreateWrapper();
+
  private:
   friend class NativeScrollBarTest;
   FRIEND_TEST_ALL_PREFIXES(NativeScrollBarTest, Scrolling);
 
   // Overridden from View.
   gfx::Size GetPreferredSize() const override;
   void Layout() override;
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
   const char* GetClassName() const override;
@@ skipping 12 matching lines @@
 
   // init border
   NativeScrollBarWrapper* native_wrapper_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeScrollBar);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_