Display -webkit-filter objects in any column (instead of only in the first one).

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

Index: third_party/WebKit/Source/core/paint/FilterPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/FilterPainter.cpp b/third_party/WebKit/Source/core/paint/FilterPainter.cpp
index bd78e6791ad977b9ab4428b03da7df82469c4db0..f3dfb3e0bc870e90e474dfc52898bd8c417bd162 100644
--- a/third_party/WebKit/Source/core/paint/FilterPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/FilterPainter.cpp
@@ -69,7 +69,13 @@ FilterPainter::FilterPainter(PaintLayer& layer, GraphicsContext& context, const
         // the layer's filter. See crbug.com/502026.
         if (webFilterOperations->isEmpty())
             return;
-        context.paintController().createAndAppend<BeginFilterDisplayItem>(*m_layoutObject, imageFilter, FloatRect(rootRelativeBounds), webFilterOperations.release());
+        LayoutRect visualBounds(rootRelativeBounds);
+        if (layer.enclosingPaginationLayer()) {
+            // Filters are set up before pagination, so we need to make the bounding box visual on our own.
+            visualBounds.moveBy(-offsetFromRoot);
+            layer.convertFromFlowThreadToVisualBoundingBoxInAncestor(paintingInfo.rootLayer, visualBounds);
+        }
+        context.paintController().createAndAppend<BeginFilterDisplayItem>(*m_layoutObject, imageFilter, FloatRect(visualBounds), webFilterOperations.release());
     }
 
     m_filterInProgress = true;