Added gfx_traits::DisplayList so metrics doesn't depend on the gfx crate for gfx::display_list::DisplayList.
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Source-Repo: https://github.com/servo/servo
Source-Revision: 8281ee004336049df11cc0478cb3c8b5610c6bde
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 07b42adf960519242136f890a37a20eb6599339a
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