Reviewed by Hyatt.
Fix <rdar://problem/5092653> REGRESSION: Image decoding making scrolling slow If decoder gave back a null frame (which I think happens regularly if you don't have full frame data yet for image that does not decode incrementally) m_decodedSize was incremented anyway. This led to massive growth in calculated image size and eventually made cache prune constantly. No test, I don't know how to make one for this. * platform/graphics/BitmapImage.cpp: (WebCore::BitmapImage::cacheFrame): git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20558 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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