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

third_party/WebKit/Source/core/paint/FilterPainter.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 "core/paint/FilterPainter.h"
 
 #include "core/paint/FilterEffectBuilder.h"
 #include "core/paint/LayerClipRecorder.h"
 #include "core/paint/PaintLayer.h"
 #include "platform/RuntimeEnabledFeatures.h"
@@ skipping 51 matching lines @@
     if (!context.paintController().displayItemConstructionIsDisabled()) {
         FilterOperations filterOperations(layer.computeFilterOperations(m_layoutObject->styleRef()));
         OwnPtr<WebFilterOperations> webFilterOperations = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
         builder.buildFilterOperations(filterOperations, webFilterOperations.get());
         // FIXME: It's possible to have empty WebFilterOperations here even
         // though the SkImageFilter produced above is non-null, since the
         // layer's FilterEffectBuilder can have a stale representation of
         // 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;
 }
 
 FilterPainter::~FilterPainter()
 {
     if (!m_filterInProgress)
         return;
 
     m_context.paintController().endItem<EndFilterDisplayItem>(*m_layoutObject);
 }
 
 } // namespace blink