Reviewed by Darin Adler.

    Reviewed by Darin Adler.

        - fix <rdar://problem/5643663> text-shadow and box-shadow offsets 1px smaller than specified
          which is the root cause of:
          http://bugs.webkit.org/show_bug.cgi?id=12943
          box-shadow: small values don't affect shadow position
          http://bugs.webkit.org/show_bug.cgi?id=14736
          Safari implementation of text-shadow off by 1px

        * platform/graphics/cg/GraphicsContextCG.cpp:
        (WebCore::GraphicsContext::setShadow): Slightly increase the magnitude
        of the offsets passed to CGContextSetShadow* to ensure that the end
        result after truncation is the desired integer offsets.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@28714 268f45cc-cd09-0410-ab3c-d52691b4dbfc