Expand PaintLayer clip to account for hidden URL bar with document.rootScroller

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 36 matching lines @@
 class HostWindow;
 class LayoutBox;
 class LayoutObject;
 class PaintLayer;
 class ProgrammaticScrollAnimator;
 struct ScrollAlignment;
 class ScrollAnchor;
 class ScrollAnimatorBase;
 class CompositorAnimationTimeline;
 
-enum IncludeScrollbarsInRect {
-  ExcludeScrollbars,
-  IncludeScrollbars,
-};
-
 class PLATFORM_EXPORT ScrollableArea : public GarbageCollectedMixin {
   WTF_MAKE_NONCOPYABLE(ScrollableArea);
 
  public:
   static int pixelsPerLineStep(HostWindow*);
   static float minFractionToStepWhenPaging();
   static int maxOverlapBetweenPages();
 
   // Convert a non-finite scroll value (Infinity, -Infinity, NaN) to 0 as
   // per http://dev.w3.org/csswg/cssom-view/#normalize-non_finite-values.
@@ skipping 368 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