Fixed clip resize for document.rootScroller with inertTopControls

third_party/WebKit/Source/platform/scroll/ScrollableArea.h

 /*
  * Copyright (C) 2008, 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 27 matching lines @@
 #include "wtf/MathExtras.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class GraphicsLayer;
 class HostWindow;
 class LayoutBox;
 class LayoutObject;
+class PaintLayer;
 class ProgrammaticScrollAnimator;
 struct ScrollAlignment;
 class ScrollAnchor;
 class ScrollAnimatorBase;
 class CompositorAnimationTimeline;
 
 enum IncludeScrollbarsInRect {
   ExcludeScrollbars,
   IncludeScrollbars,
 };
@@ skipping 135 matching lines @@
   }
   virtual IntPoint convertFromContainingWidgetToScrollbar(
       const Scrollbar& scrollbar,
       const IntPoint& parentPoint) const {
     return scrollbar.Widget::convertFromContainingWidget(parentPoint);
   }
 
   virtual Scrollbar* horizontalScrollbar() const { return nullptr; }
   virtual Scrollbar* verticalScrollbar() const { return nullptr; }
 
+  virtual PaintLayer* layer() const { return nullptr; }
+
   // scrollPosition is the location of the top/left of the scroll viewport in
   // the coordinate system defined by the top/left of the overflow rect.
   // scrollOffset is the offset of the scroll viewport from its position when
   // scrolled all the way to the beginning of its content's flow.
   // For a more detailed explanation of scrollPosition, scrollOffset, and
   // scrollOrigin, see core/layout/README.md.
   FloatPoint scrollPosition() const {
     return FloatPoint(scrollOrigin()) + scrollOffset();
   }
   virtual IntSize scrollOffsetInt() const = 0;
@@ skipping 224 matching lines @@
   // vertical-lr / ltr            NO                      NO
   // vertical-lr / rtl            NO                      YES
   // vertical-rl / ltr            YES                     NO
   // vertical-rl / rtl            YES                     YES
   IntPoint m_scrollOrigin;
 };
 
 }  // namespace blink
 
 #endif  // ScrollableArea_h