Improving the appearance of overlay scrollbars

ui/views/controls/scrollbar/cocoa_scroll_bar.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_SCROLLBAR_COCOA_SCROLL_BAR_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_COCOA_SCROLL_BAR_H_
 
 #include "base/macros.h"
 #import "base/mac/scoped_nsobject.h"
 #include "ui/compositor/layer_animation_observer.h"
@@ skipping 41 matching lines @@
   NSScrollerStyle GetScrollerStyle() const { return scroller_style_; }
 
   // Returns true if the opacity is 0.0.
   bool IsScrollbarFullyHidden() const;
 
  protected:
   // BaseScrollBar:
   gfx::Rect GetTrackBounds() const override;
 
   // ScrollBar:
-  int GetLayoutSize() const override;
-  int GetContentOverlapSize() const override;
+  int GetThickness() const override;
+  bool OverlapsContent() const override;
 
   // View:
   void Layout() override;
   gfx::Size GetPreferredSize() const override;
   void OnPaint(gfx::Canvas* canvas) override;
 
  private:
   friend class BaseScrollBar;  // For BaseScrollBar::GetHideTimerForTest().
 
   // Methods to change the visibility of the scrollbar.
@@ skipping 46 matching lines @@
 
   // The bridge for NSScroller.
   base::scoped_nsobject<ViewsScrollbarBridge> bridge_;
 
   DISALLOW_COPY_AND_ASSIGN(CocoaScrollBar);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_COCOA_SCROLL_BAR_H_