FrameView now notifies ScrollCoorinator of changes in its scrollable area set

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 41 matching lines @@
 class LocalFrame;
 class KURL;
 class Node;
 class Page;
 class RenderBox;
 class RenderEmbeddedObject;
 class RenderObject;
 class RenderPart;
 class RenderScrollbarPart;
 class RenderView;
+class ScrollingCoordinator;
 struct CompositedSelectionBound;
 
 typedef unsigned long long DOMTimeStamp;
 
 class FrameView final : public Widget, public ScrollableArea {
 public:
     friend class RenderView;
     friend class Internals;
 
     static PassRefPtrWillBeRawPtr<FrameView> create(LocalFrame*);
@@ skipping 606 matching lines @@
     // notifyScrollPositionChanged...there's too many ways to scroll this class. This needs
     // some cleanup.
     void setScrollOffsetFromUpdateScrollbars(const DoubleSize&);
 
     IntRect rectToCopyOnScroll() const;
 
     void updateOverhangAreas();
 
     bool isFrameViewScrollbar(const Widget* child) const { return horizontalScrollbar() == child || verticalScrollbar() == child; }
 
+    ScrollingCoordinator* scrollingCoordinator();
+
     static double s_currentFrameTimeStamp; // used for detecting decoded resource thrash in the cache
 
     LayoutSize m_size;
 
     typedef WillBeHeapHashSet<RefPtrWillBeMember<RenderEmbeddedObject>> EmbeddedObjectSet;
     WillBeHeapHashSet<RefPtrWillBeMember<RenderEmbeddedObject>> m_partUpdateSet;
 
     // FIXME: These are just "children" of the FrameView and should be RefPtrWillBeMember<Widget> instead.
     WillBeHeapHashSet<RefPtrWillBeMember<RenderPart>> m_parts;
 
@@ skipping 163 matching lines @@
     }
 
 private:
     RawPtrWillBeMember<FrameView> m_view;
     bool m_originalValue;
 };
 
 } // namespace blink
 
 #endif // FrameView_h