OverscrollGlow for mainThread-{BLINK CHANGES}

Source/core/layout/LayoutBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 72 matching lines @@
 
     virtual bool backgroundShouldAlwaysBeClipped() const { return false; }
 
     // Use this with caution! No type checking is done!
     LayoutBox* firstChildBox() const;
     LayoutBox* lastChildBox() const;
 
     int pixelSnappedWidth() const { return m_frameRect.pixelSnappedWidth(); }
     int pixelSnappedHeight() const { return m_frameRect.pixelSnappedHeight(); }
 
+    IntPoint unUsedDelta() const { return m_unusedDelta; }
+
     void setX(LayoutUnit x)
     {
         if (x == m_frameRect.x())
             return;
         m_frameRect.setX(x);
         frameRectChanged();
     }
     void setY(LayoutUnit y)
     {
         if (y == m_frameRect.y())
@@ skipping 717 matching lines @@
     {
         // The frame rect may change because of layout of other objects.
         // Should check this object for paint invalidation.
         if (!needsLayout())
             setMayNeedPaintInvalidation();
     }
 
     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
     LayoutRect m_frameRect;
 
+    // UnUsed Delta after scroll.
+    IntPoint m_unusedDelta;

[majidvp, 2015/04/23 18:25:08]

It does not make sense to have this information in LayoutBox. Unused scroll
delta needs to only be tracked for main frame and then only
during a single scroll event. I don't think it needs to be a member.

[MuVen, 2015/04/27 12:53:46]

Done.

+
     // Our intrinsic height, used for min-height: min-content etc. Maintained by
     // updateLogicalHeight. This is logicalHeight() before it is clamped to
     // min/max.
     mutable LayoutUnit m_intrinsicContentLogicalHeight;
 
     void inflatePaintInvalidationRectForReflectionAndFilter(LayoutRect&) const;
 
     LayoutRectOutsets m_marginBoxOutsets;
 
 protected:
@@ skipping 79 matching lines @@
         if (UNLIKELY(inlineBoxWrapper() != 0))
             deleteLineBoxWrapper();
     }
 
     ensureRareData().m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace blink
 
 #endif // LayoutBox_h