Comment #8 on issue 22700 by [email protected]: Skia color alpha  
blending calculation is slightly different from other webkit libs
http://code.google.com/p/chromium/issues/detail?id=22700

Part (2) above was fixed in upstream WebKit as  
http://trac.webkit.org/changeset/50408.

Part (1) is still problematic.  I can fix the division to be more accurate  
(using
SkDiv255Round()), but it gives an unacceptable performance hit.  I'm going  
to try
goosing the performance with SSE first, then add back the accuracy trick  
and see if
the perf hit is acceptable at that point.

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