Remove some unnecessary and precision-losing pixel snapping code.

Source/core/paint/BoxPainter.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 "config.h"
 #include "core/paint/BoxPainter.h"
 
 #include "core/HTMLNames.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
@@ skipping 668 matching lines @@
         if (fixedBackgroundPaintsInLocalCoordinates(obj))
             viewportRect.setLocation(IntPoint());
         else if (FrameView* frameView = obj.view()->frameView())
             viewportRect.setLocation(IntPoint(frameView->scrollOffsetForViewportConstrainedObjects()));
 
         if (paintContainer) {
             IntPoint absoluteContainerOffset = roundedIntPoint(paintContainer->localToAbsolute(FloatPoint()));
             viewportRect.moveBy(-absoluteContainerOffset);
         }
 
-        geometry.setDestRect(pixelSnappedIntRect(viewportRect));
+        geometry.setDestRect(viewportRect);

[leviw_travelin_and_unemployed, 2015/02/25 18:32:28]

Can't we pixel snap this just a few more times to be sure? ;)

         positioningAreaSize = geometry.destRect().size();
     }
 
     const LayoutObject* clientForBackgroundImage = backgroundObject ? backgroundObject : &obj;
     IntSize fillTileSize = calculateFillTileSize(obj, fillLayer, positioningAreaSize);
     fillLayer.image()->setContainerSizeForRenderer(clientForBackgroundImage, fillTileSize, obj.style()->effectiveZoom());
     geometry.setTileSize(fillTileSize);
 
     EFillRepeat backgroundRepeatX = fillLayer.repeatX();
     EFillRepeat backgroundRepeatY = fillLayer.repeatY();
@@ skipping 1491 matching lines @@
 
     FloatPoint secondQuad[4];
     secondQuad[0] = quad[0];
     secondQuad[1] = FloatPoint(quad[0].x() - r1 * cx, quad[0].y() - r1 * cy);
     secondQuad[2] = quad[2];
     secondQuad[3] = quad[3];
     graphicsContext->clipPolygon(4, secondQuad, !secondEdgeMatches);
 }
 
 } // namespace blink