Phil Cohen <phillco@fb.com> [Thu, 24 Aug 2017 21:30:37 -0700] rev 33921
contrib: make simplemerge script pass context-like objects
`simplemerge()` will soon require context-like objects to work. Create a simple
context-like object that wraps the requested files and can be passed to the new
API.
Differential Revision: https://phab.mercurial-scm.org/D378