DevTools is about to move out of mozilla-central and be released as an add-on.
So that these protocol files are going to be missing from the tree.
To accommodate that, we are doing a copy of them next to marionette.
MozReview-Commit-ID: 9PyhuwyZyXI
--HG--
extra : rebase_source : b6d96ae5e4c4ac837713e396ab72163b168871f2
Alexandre Poirot