Get rid of LayerPainter::paintTransformedLayerIntoFragments().

Source/core/paint/ClipRecorder.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 ClipRecorder_h
 #define ClipRecorder_h
 
 #include "core/paint/ViewDisplayList.h"
 #include "core/rendering/LayerPaintingInfo.h"
 #include "core/rendering/PaintPhase.h"
@@ skipping 34 matching lines @@
 
     enum BorderRadiusClippingRule { IncludeSelfForBorderRadius, DoNotIncludeSelfForBorderRadius };
 
     // Set rounded clip rectangles defined by border radii all the way from the LayerPaintingInfo
     // "root" layer down to the specified layer (or the parent of said layer, in case
     // BorderRadiusClippingRule says to skip self). fragmentOffset is used for multicol, to specify
     // the translation required to get from flow thread coordinates to visual coordinates for a
     // certain column.
     // FIXME: The BorderRadiusClippingRule parameter is really useless now. If we want to skip self,
     // why not just supply the parent layer as the first parameter instead?
+    // FIXME: The ClipRect passed is in visual coordinates (not flow thread coordinates), but at the
+    // same time we pass a fragmentOffset, so that we can translate from flow thread coordinates to
+    // visual coordinates. This may look rather confusing/redundant, but it is needed for rounded
+    // border clipping. Would be nice to clean up this.
     explicit ClipRecorder(const RenderLayerModelObject*, GraphicsContext*, DisplayItem::Type, const ClipRect&, const LayerPaintingInfo* localPaintingInfo, const LayoutPoint& fragmentOffset, PaintLayerFlags, BorderRadiusClippingRule = IncludeSelfForBorderRadius);
 
     ~ClipRecorder();
 
 private:
 
     void collectRoundedRectClips(RenderLayer&, const LayerPaintingInfo& localPaintingInfo, GraphicsContext*, const LayoutPoint& fragmentOffset, PaintLayerFlags,
         BorderRadiusClippingRule, Vector<RoundedRect>& roundedRectClips);
 
     GraphicsContext* m_graphicsContext;
     const RenderLayerModelObject* m_renderer;
 };
 
 } // namespace blink
 
 #endif // ViewDisplayList_h