Improving the appearance of overlay scrollbars

ui/views/controls/scrollbar/scroll_bar_views.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_SCROLL_BAR_VIEWS_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_SCROLL_BAR_VIEWS_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/gfx/geometry/point.h"
@@ skipping 21 matching lines @@
   static int GetVerticalScrollBarWidth(const ui::NativeTheme* theme);
 
  protected:
   // View overrides:
   void Layout() override;
   void OnPaint(gfx::Canvas* canvas) override;
   gfx::Size GetPreferredSize() const override;
   const char* GetClassName() const override;
 
   // ScrollBar overrides:
-  int GetLayoutSize() const override;
+  int GetThickness() const override;
 
   // BaseButton::ButtonListener overrides:
   void ButtonPressed(Button* sender, const ui::Event& event) override;
 
   // Returns the area for the track. This is the area of the scrollbar minus
   // the size of the arrow buttons.
   gfx::Rect GetTrackBounds() const override;
 
  private:
   static int GetHorizontalScrollBarHeight(const ui::NativeTheme* theme);
 
   // The scroll bar buttons (Up/Down, Left/Right).
   Button* prev_button_;
   Button* next_button_;
 
   ui::NativeTheme::ExtraParams params_;
   ui::NativeTheme::Part part_;
   ui::NativeTheme::State state_;
 
   DISALLOW_COPY_AND_ASSIGN(ScrollBarViews);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_SCROLL_BAR_VIEWS_H_