Plumb selection bounds as a single unit

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 46 matching lines @@
 class Node;
 class Page;
 class LayoutAnalyzer;
 class LayoutBox;
 class LayoutEmbeddedObject;
 class LayoutObject;
 class LayoutScrollbarPart;
 class LayoutView;
 class ScrollingCoordinator;
 class TracedValue;
-struct CompositedSelectionBound;
+struct CompositedSelection;
 
 typedef unsigned long long DOMTimeStamp;
 
 class CORE_EXPORT FrameView final : public Widget, public ScrollableArea {
 public:
     friend class LayoutView;
     friend class Internals;
 
     static PassRefPtrWillBeRawPtr<FrameView> create(LocalFrame*);
     static PassRefPtrWillBeRawPtr<FrameView> create(LocalFrame*, const IntSize& initialSize);
@@ skipping 595 matching lines @@
     void scheduleUpdateWidgetsIfNecessary();
     void updateWidgetsTimerFired(Timer<FrameView>*);
     bool updateWidgets();
 
     void scrollToAnchor();
     void scrollPositionChanged();
     void didScrollTimerFired(Timer<FrameView>*);
 
     void updateLayersAndCompositingAfterScrollIfNeeded();
 
-    static bool computeCompositedSelectionBounds(LocalFrame&, CompositedSelectionBound& start, CompositedSelectionBound& end);
-    void updateCompositedSelectionBoundsIfNeeded();
+    static bool computeCompositedSelection(LocalFrame&, CompositedSelection&);
+    void updateCompositedSelectionIfNeeded();
 
     // Returns true if the FrameView's own scrollbars overlay its content when visible.
     bool hasOverlayScrollbars() const;
 
     // Returns true if the frame should use custom scrollbars. If true, one of
     // either |customScrollbarElement| or |customScrollbarFrame| will be set to
     // the element or frame which owns the scrollbar with the other set to null.
     bool shouldUseCustomScrollbars(Element*& customScrollbarElement, LocalFrame*& customScrollbarFrame) const;
 
     // Returns true if a scrollbar needs to go from native -> custom or vice versa.
@@ skipping 179 matching lines @@
     static const unsigned visualPixelThreshold = 32 * 32;
     if (m_visuallyNonEmptyPixelCount > visualPixelThreshold)
         setIsVisuallyNonEmpty();
 }
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
 
 } // namespace blink
 
 #endif // FrameView_h