Unreviewed. Add myself to contributor and watch lists

    * Scripts/webkitpy/common/config/contributors.json:
    * Scripts/webkitpy/common/config/watchlist:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@163446 268f45cc-cd09-0410-ab3c-d52691b4dbfc
fast/hidpi/image-srcset-relative-svg-canvas.html needs ImageOnlyFailure tag.

* TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@163447 268f45cc-cd09-0410-ab3c-d52691b4dbfc