[CSS Shapes] First line gets incorrectly adjusted in shape-inside due to rounding

Source/core/rendering/shapes/RectangleShape.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. 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.
@@ skipping 145 matching lines @@
     result.append(LineSegment(x1, x2));
 }
 
 static FloatPoint cornerInterceptForWidth(float width, float widthAtIntercept, float rx, float ry)
 {
     float xi = (width - widthAtIntercept) / 2;
     float yi = ry - ellipseYIntercept(rx - xi, rx, ry);
     return FloatPoint(xi, yi);
 }
 
-bool RectangleShape::firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize& minLogicalIntervalSize, LayoutUnit& result) const
+bool RectangleShape::firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const FloatSize& minLogicalIntervalSize, LayoutUnit& result) const
 {
     float minIntervalTop = minLogicalIntervalTop;
     float minIntervalHeight = minLogicalIntervalSize.height();
     float minIntervalWidth = minLogicalIntervalSize.width();
 
     const FloatRect& bounds = shapePaddingBounds();
     if (bounds.isEmpty() || minIntervalWidth > bounds.width())
         return false;
 
     float minY = LayoutUnit::fromFloatCeil(std::max(bounds.y(), minIntervalTop));
@@ skipping 33 matching lines @@
         if (intervalFitsWithinCorners || minY <=  bounds.maxY() - cornerIntercept.y() - minIntervalHeight) {
             result = minY;
             return true;
         }
     }
 
     return false;
 }
 
 } // namespace WebCore