Fix fixed-background offset issue

Source/core/paint/BoxPainter.cpp

 // 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.
 
 #include "config.h"
 #include "core/paint/BoxPainter.h"
 
 #include "core/HTMLNames.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
@@ skipping 424 matching lines @@
     }
     case BorderFillBox:
         break;
     default:
         ASSERT_NOT_REACHED();
         break;
     }
 
     BackgroundImageGeometry geometry;
     if (bgImage)
-        geometry.calculate(obj, paintInfo.paintContainer(), paintInfo.globalPaintFlags(), bgLayer, scrolledPaintRect, backgroundObject);
+        geometry.calculate(obj, paintInfo.paintContainer(), paintInfo.globalPaintFlags(), bgLayer, scrolledPaintRect, paintInfo.accumulatedScrollOffsetSincePaintContainer, backgroundObject);
     bool shouldPaintBackgroundImage = bgImage && bgImage->canRender(obj, obj.style()->effectiveZoom());
 
     // Paint the color first underneath all images, culled if background image occludes it.
     // TODO(trchen): In the !bgLayer.hasRepeatXY() case, we could improve the culling test
     // by verifying whether the background image covers the entire painting area.
     if (isBottomLayer) {
         IntRect backgroundRect(pixelSnappedIntRect(scrolledPaintRect));
         bool boxShadowShouldBeAppliedToBackground = obj.boxShadowShouldBeAppliedToBackground(bleedAvoidance, box);
         bool backgroundImageOccludesBackgroundColor = shouldPaintBackgroundImage && isFillLayerOpaque(bgLayer, obj);
         if (boxShadowShouldBeAppliedToBackground || !backgroundImageOccludesBackgroundColor)  {
@@ skipping 306 matching lines @@
     }
 }
 
 bool BoxPainter::shouldForceWhiteBackgroundForPrintEconomy(const ComputedStyle& style, const Document& document)
 {
     return document.printing() && style.printColorAdjust() == PrintColorAdjustEconomy
         && (!document.settings() || !document.settings()->shouldPrintBackgrounds());
 }
 
 } // namespace blink