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        Reviewed by David Kilzer.

        https://bugs.webkit.org/show_bug.cgi?id=25462

        Make sure "--pixel --add-platform-exceptions" produces platform
        specific pixel test results.

        * Scripts/run-webkit-tests: Support "--pixel
        --add-platform-exceptions"

git-svn-id: svn://svn.chromium.org/blink/trunk@42979 bbb929c8-8fbe-4397-9dbb-9b2b20218538