Summary:
"differential.creatediff" requires a mostly-parsed diff, but there's no reason we can't make DifferentialDiffs out of raw diffs.
This mainly serves to lower the adoption barrier if getting "arc" distributed is too much of a hassle.
Test Plan: Made a diff out of a raw block of diff text.
Reviewers: ffx, vrana, btrahan
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D2751
a4e2eb3d8c