iPhone 5c marketing site repaints incorrectly with layer squashing

Source/platform/geometry/LayoutRect.h

 /*
  * Copyright (c) 2012, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 153 matching lines @@
     LayoutRect transposedRect() const { return LayoutRect(m_location.transposedPoint(), m_size.transposedSize()); }
 
     static LayoutRect infiniteRect()
     {
         // Return a rect that is slightly smaller than the true max rect to allow pixelSnapping to round up to the nearest IntRect without overflowing.
         return LayoutRect(LayoutUnit::nearlyMin() / 2, LayoutUnit::nearlyMin() / 2, LayoutUnit::nearlyMax(), LayoutUnit::nearlyMax());
     }
 
 #ifndef NDEBUG
     // Prints the rect to the screen.
-    void show(bool showRawValue = false);
+    void show(bool showRawValue = false) const;
 #endif
 
 private:
     LayoutPoint m_location;
     LayoutSize m_size;
 };
 
 inline LayoutRect intersection(const LayoutRect& a, const LayoutRect& b)
 {
     LayoutRect c = a;
@@ skipping 41 matching lines @@
 }
 
 inline IntRect pixelSnappedIntRect(LayoutPoint location, LayoutSize size)
 {
     return IntRect(roundedIntPoint(location), pixelSnappedIntSize(size, location));
 }
 
 } // namespace WebCore
 
 #endif // LayoutRect_h