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        Reviewed by Oliver Hunt.

        A width or height of zero for the destination or source rect of an
        image causes a not invertible pattern matrix.
        This crahes newer versions of Cairo and give some graphic gliches in
        Canvas.
        With this patch we check if there is something to draw and return if not.

        * platform/graphics/cairo/ImageCairo.cpp:
        (WebCore::BitmapImage::draw):


git-svn-id: svn://svn.chromium.org/blink/trunk@42875 bbb929c8-8fbe-4397-9dbb-9b2b20218538