Don't cancel out scroll offset when calculating the clip rectangle for multicol.

third_party/WebKit/Source/core/paint/PaintLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 1617 matching lines @@
     // context and the root layer.
     offsetOfPaginationLayerFromRoot =
         -rootLayer->visualOffsetFromAncestor(enclosingPaginationLayer());
   } else {
     offsetOfPaginationLayerFromRoot =
         enclosingPaginationLayer()->visualOffsetFromAncestor(rootLayer);
   }
   // Make the dirty rect relative to the fragmentation context (multicol
   // container, etc.).
   LayoutRect dirtyRectInMulticolContainer(dirtyRect);
-  dirtyRectInMulticolContainer.move(enclosingPaginationLayer()->location() -
+  dirtyRectInMulticolContainer.move(enclosingFlowThread->physicalLocation() -
                                     offsetOfPaginationLayerFromRoot);
 
   // Slice the layer into fragments. Each fragment needs to be processed (e.g.
   // painted) separately. We pass enough information to walk a minimal number of
   // fragments based on the pages/columns that intersect the actual dirtyRect as
   // well as the pages/columns that intersect our layer's bounding box.
   FragmentainerIterator iterator(*enclosingFlowThread,
                                  layerBoundingBoxInFlowThread,
                                  dirtyRectInMulticolContainer);
   if (iterator.atEnd())
@@ skipping 1572 matching lines @@
 }
 
 void showLayerTree(const blink::LayoutObject* layoutObject) {
   if (!layoutObject) {
     LOG(INFO) << "Cannot showLayerTree. Root is (nil)";
     return;
   }
   showLayerTree(layoutObject->enclosingLayer());
 }
 #endif