Views overlay scrollbars - show on mouse hover.

ui/views/controls/scrollbar/overlay_scroll_bar.h

 // Copyright 2013 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_OVERLAY_SCROLL_BAR_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
 
 #include "base/macros.h"
 #include "ui/views/controls/scrollbar/base_scroll_bar.h"
 #include "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
 
 namespace views {
 
 // The transparent scrollbar which overlays its contents.
 class VIEWS_EXPORT OverlayScrollBar : public BaseScrollBar {
  public:
   explicit OverlayScrollBar(bool horizontal);
   ~OverlayScrollBar() override;
 
  protected:
   // BaseScrollBar overrides:
   gfx::Rect GetTrackBounds() const override;
 
   // ScrollBar overrides:
   int GetThickness() const override;
   bool OverlapsContent() const override;
 
   // View overrides:
   void Layout() override;
-  bool CanAcceptEvent(const ui::Event& event) override;
   void OnMouseEntered(const ui::MouseEvent& event) override;
   void OnMouseExited(const ui::MouseEvent& event) override;
 
  private:
   class Thumb : public BaseScrollBarThumb {
    public:
     explicit Thumb(OverlayScrollBar* scroll_bar);
     ~Thumb() override;
 
     void Init();
@@ skipping 20 matching lines @@
   void StartHideCountdown();
 
   base::Timer hide_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(OverlayScrollBar);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_