Reviewed by Dave Hyatt

        https://bugs.webkit.org/show_bug.cgi?id=22026

        When computing the bounds of the transparency layer, we need to
        map the clipRect through the enclosing transform.

        Test: fast/layers/opacity-transforms.html

        * rendering/RenderLayer.cpp:
        (WebCore::transparencyClipBox):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38079 268f45cc-cd09-0410-ab3c-d52691b4dbfc