Improving the appearance of overlay scrollbars

ui/views/controls/scroll_view.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_SCROLL_VIEW_H_
 #define UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 56 matching lines @@
     hide_horizontal_scrollbar_ = visible;
   }
 
   // Turns this scroll view into a bounded scroll view, with a fixed height.
   // By default, a ScrollView will stretch to fill its outer container.
   void ClipHeightTo(int min_height, int max_height);
 
   // Returns whether or not the ScrollView is bounded (as set by ClipHeightTo).
   bool is_bounded() const { return max_height_ >= 0 && min_height_ >= 0; }
 
-  // Retrieves the width/height of scrollbars. These return 0 if the scrollbar
-  // has not yet been created.
-  int GetScrollBarWidth() const;
-  int GetScrollBarHeight() const;
+  // Retrieves the width/height reserved for scrollbars. These return 0 if the
+  // scrollbar has not yet been created or in the case of overlay scrollbars.
+  int GetScrollBarLayoutWidth() const;
+  int GetScrollBarLayoutHeight() const;
 
   // Returns the horizontal/vertical scrollbar. This may return NULL.
   const ScrollBar* horizontal_scroll_bar() const { return horiz_sb_; }
   const ScrollBar* vertical_scroll_bar() const { return vert_sb_; }
 
   // Customize the scrollbar design. ScrollView takes the ownership of the
   // specified ScrollBar. |horiz_sb| and |vert_sb| cannot be NULL.
   void SetHorizontalScrollBar(ScrollBar* horiz_sb);
   void SetVerticalScrollBar(ScrollBar* vert_sb);
 
@@ skipping 167 matching lines @@
  private:
   int top_margin_;
   int row_height_;
 
   DISALLOW_COPY_AND_ASSIGN(FixedRowHeightScrollHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLL_VIEW_H_