ResizeObserver pt6: integration

third_party/WebKit/Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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 1527 matching lines @@
                 setShouldDoFullPaintInvalidation();
 
             if (drawingBackground)
                 invalidateBackgroundObscurationStatus();
             return true;
         }
     }
     return false;
 }
 
+void LayoutBox::frameRectChanged()
+{
+    if (node() && node()->isElementNode()) {
+        Element& element = toElement(*node());
+        element.sizeMayHaveChanged();
+    }
+    // The frame rect may change because of layout of other objects.
+    // Should check this object for paint invalidation.
+    if (!needsLayout())
+        setMayNeedPaintInvalidation();
+}
+
 bool LayoutBox::intersectsVisibleViewport()
 {
     LayoutRect rect = visualOverflowRect();
     LayoutView* layoutView = view();
     while (layoutView->frame()->ownerLayoutObject())
         layoutView = layoutView->frame()->ownerLayoutObject()->view();
     mapToVisualRectInAncestorSpace(layoutView, rect);
     return rect.intersects(LayoutRect(layoutView->frameView()->getScrollableArea()->visibleContentRectDouble()));
 }
 
@@ skipping 3407 matching lines @@
         m_rareData->m_snapAreas->remove(&snapArea);
     }
 }
 
 SnapAreaSet* LayoutBox::snapAreas() const
 {
     return m_rareData ? m_rareData->m_snapAreas.get() : nullptr;
 }
 
 } // namespace blink