Overlay scrollbars flush with window edge

third_party/WebKit/public/platform/WebThemeEngine.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 122 matching lines @@
     bool determinate;
     int valueRectX;
     int valueRectY;
     int valueRectWidth;
     int valueRectHeight;
   };
 
   // Extra parameters for scrollbar thumb. Used only for overlay scrollbars.
   struct ScrollbarThumbExtraParams {
     WebScrollbarOverlayColorTheme scrollbarTheme;
+    bool isVerticalScrollbar;
+    bool isLeftVerticalScrollbar;
+    bool hitStart;
+    bool hitEnd;
   };
 
   union ExtraParams {
     ScrollbarTrackExtraParams scrollbarTrack;
     ButtonExtraParams button;
     TextFieldExtraParams textField;
     MenuListExtraParams menuList;
     SliderExtraParams slider;
     InnerSpinButtonExtraParams innerSpin;
     ProgressBarExtraParams progressBar;
@@ skipping 33 matching lines @@
   virtual void paint(WebCanvas*,
                      Part,
                      State,
                      const WebRect&,
                      const ExtraParams*) {}
 };
 
 }  // namespace blink
 
 #endif