https://bugs.webkit.org/show_bug.cgi?id=68973

Reviewed by Eric Seidel.

* Scripts/webkitpy/common/host.py: Exposed the watch_list.
* Scripts/webkitpy/common/watchlist/watchlist.py: Changed to return
the cc and messages as sorted lists. To allow for deterministic ordering.
* Scripts/webkitpy/common/watchlist/watchlist_unittest.py: Ditto.
* Scripts/webkitpy/tool/commands/__init__.py: Add ApplyWatchListLocal so
that it will be exposed as a command by webkit-patch.
* Scripts/webkitpy/tool/commands/applywatchlistlocal.py: Added.
* Scripts/webkitpy/tool/commands/applywatchlistlocal_unittest.py: Added.
* Scripts/webkitpy/tool/commands/download.py: Added ApplyWatchList which mimics CheckStyle.
* Scripts/webkitpy/tool/commands/download_unittest.py: Added an appropriate test.
* Scripts/webkitpy/tool/mocktool.py: Mock out the watch list.
* Scripts/webkitpy/tool/steps/__init__.py: Added ApplyWatchList.
* Scripts/webkitpy/tool/steps/applywatchlist.py: Added.
* Scripts/webkitpy/tool/steps/applywatchlist_unittest.py: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96444 268f45cc-cd09-0410-ab3c-d52691b4dbfc