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        Reviewed by Darin Adler.

        <rdar://problem/6822344> Use of QTMovieCurrentSizeAttribute generates exception and will crash

        QTMovieCurrentSizeAttribute generates an exception with some versions of QTKit, so calculate a 
        multiplier to scale from natural size to current size when a movie is opened and use that to 
        return the correct value from the naturalSize() method.

        * platform/graphics/mac/MediaPlayerPrivateQTKit.h:
        * platform/graphics/mac/MediaPlayerPrivateQTKit.mm:
        (WebCore::MediaPlayerPrivate::MediaPlayerPrivate): Initialize m_scaleFactor.
        (WebCore::MediaPlayerPrivate::naturalSize): Return naturalSize transformed by initial scale.
        (WebCore::MediaPlayerPrivate::cacheMovieScale): New, calculate difference between initial
        size and natural size so naturalSize() accounts for non-identity movie matrix.
        (WebCore::MediaPlayerPrivate::updateStates): Call cacheMovieScale when load state reaches
        QTMovieLoadStateLoaded for the first time.



git-svn-id: svn://svn.chromium.org/blink/trunk@42918 bbb929c8-8fbe-4397-9dbb-9b2b20218538