Reinstate early out from antialiased path rendering if we
Derek Sollenberger authored
anticipate overflow (or if the path is completely clipped out).

http://code.google.com/p/skia/source/detail?r=3658

bug: 6208579
Change-Id: If9749231bea465c3d35cc98c1b8e2fad3c7aeff6
bf7bfdcb
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