Reviewed by Hyatt.

    Reviewed by Hyatt.

        - fixed <rdar://problem/4092614> REGRESSION (Tiger): progressively loaded background images "scroll around" instead of just appearing

        * WebCoreSupport.subproj/WebImageData.m:
        (-[WebImageData _imageSourceOptions]): Moved a global inside this function, since it's only used here.
        (-[WebImageData _cacheImages:allImages:]): Fixed a sizeof that was getting the size of the wrong thing.
        (-[WebImageData _isSizeAvailable]): Used calloc in a more consistent way.
        (drawPattern): Removed an unneeded cast.
        (-[WebImageData tileInRect:fromPoint:context:]): Here's the actual bug fix. Don't use the image size
        when deciding whether the image needs to be tiled as a pattern nor when creating the pattern: in both
        cases, use the tile size. The old way was wrong, and the new way works perfectly. Also removed uneeded
        error message when the image is not yet loaded enough to create a CGImageRef for it -- it's fine to
        draw nothing in that case.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9032 268f45cc-cd09-0410-ab3c-d52691b4dbfc