Fix fixed-background offset issue

Source/core/paint/BackgroundImageGeometry.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BackgroundImageGeometry_h
 #define BackgroundImageGeometry_h
 
 #include "core/paint/PaintPhase.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/IntSize.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class FillLayer;
 class LayoutBoxModelObject;
 class LayoutObject;
 class LayoutRect;
 
 class BackgroundImageGeometry {
     STACK_ALLOCATED();
 public:
     BackgroundImageGeometry()
         : m_hasNonLocalGeometry(false)
     { }
 
     void calculate(const LayoutBoxModelObject&, const LayoutBoxModelObject* paintContainer,
         const GlobalPaintFlags, const FillLayer&, const LayoutRect& paintRect,
+        // Used during painting to compensate ScrollRecorders for fixed background
+        const IntPoint& accumulatedScrollOffsetSincePaintContainer = IntPoint(),
         LayoutObject* backgroundObject = nullptr);
 
     IntRect destRect() const { return m_destRect; }
     IntSize tileSize() const { return m_tileSize; }
     IntPoint phase() const { return m_phase; }
     // Space-size represents extra width and height that may be added to
     // the image if used as a pattern with background-repeat: space.
     IntSize spaceSize() const { return m_repeatSpacing; }
     // Has background-attachment: fixed. Implies that we can't always cheaply compute destRect.
     bool hasNonLocalGeometry() const { return m_hasNonLocalGeometry; }
@@ skipping 15 matching lines @@
     IntRect m_destRect;
     IntPoint m_phase;
     IntSize m_tileSize;
     IntSize m_repeatSpacing;
     bool m_hasNonLocalGeometry;
 };
 
 } // namespace blink
 
 #endif // BackgroundImageGeometry_h