Avoid converting an IntRect to IntRect via FloatRect

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 3313 matching lines @@
     paintScrollbar(scrollableArea->horizontalScrollbar(), builder.context(),
                    interestRect);
   } else if (graphicsLayer == layerForVerticalScrollbar()) {
     paintScrollbar(scrollableArea->verticalScrollbar(), builder.context(),
                    interestRect);
   } else if (graphicsLayer == layerForScrollCorner()) {
     // Note that scroll corners always paint into local space, whereas
     // scrollbars paint in the space of their containing frame.
     IntPoint scrollCornerAndResizerLocation =
         scrollableArea->scrollCornerAndResizerRect().location();
-    CullRect cullRect(enclosingIntRect(interestRect));
+    CullRect cullRect(interestRect);
     ScrollableAreaPainter(*scrollableArea)
         .paintScrollCorner(builder.context(), -scrollCornerAndResizerLocation,
                            cullRect);
     ScrollableAreaPainter(*scrollableArea)
         .paintResizer(builder.context(), -scrollCornerAndResizerLocation,
                       cullRect);
   }
   // Replay the painted scrollbar content with the GraphicsLayer backing as the
   // DisplayItemClient in order for the resulting DrawingDisplayItem to produce
   // the correct visualRect (i.e., the bounds of the involved GraphicsLayer).
@@ skipping 201 matching lines @@
   } else if (graphicsLayer == m_decorationOutlineLayer.get()) {
     name = "Decoration Layer";
   } else {
     NOTREACHED();
   }
 
   return name;
 }
 
 }  // namespace blink