Fix gradient background invalidation when HTML size changes

third_party/WebKit/Source/core/layout/LayoutView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 111 matching lines @@
                                       MapCoordinatesFlags,
                                       VisualRectFlags) const;
   bool mapToVisualRectInAncestorSpace(
       const LayoutBoxModelObject* ancestor,
       LayoutRect&,
       VisualRectFlags = DefaultVisualRectFlags) const override;
   LayoutSize offsetForFixedPosition(bool includePendingScroll = false) const;
 
   void invalidatePaintForViewAndCompositedLayers();
 
+  PaintInvalidationReason invalidatePaintIfNeeded(
+      const PaintInvalidationState&) override;
+  PaintInvalidationReason invalidatePaintIfNeeded(
+      const PaintInvalidatorContext&) const override;
+
   void paint(const PaintInfo&, const LayoutPoint&) const override;
   void paintBoxDecorationBackground(const PaintInfo&,
                                     const LayoutPoint&) const override;
 
   enum SelectionPaintInvalidationMode {
     PaintInvalidationNewXOROld,
     PaintInvalidationNewMinusOld
   };
   void setSelection(
       LayoutObject* start,
@@ skipping 171 matching lines @@
   unsigned m_hitTestCount;
   unsigned m_hitTestCacheHits;
   Persistent<HitTestCache> m_hitTestCache;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutView, isLayoutView());
 
 }  // namespace blink
 
 #endif  // LayoutView_h