Summary:
Ref T11524. Ref T10423. Earlier, I converted `diffusion.filecontentquery` to put the actual file content in Files, then return a PHID for the file, instead of trying to send the content over Conduit.
In T11524, we have a similar set of problems with diffs that contain non-UTF8 data (and, in T10423, diffs that are simply enormous).
I want to provide an API method to do the same sort of thing with diff output (like from `git diff`), so we call the method, it shoves the data in Files, and then we go pull it out of Files.
To support this, take the "shove the output of a Future into Files" logic and put it in a new base `FileFuture` query. This will let me make `RawDiffQuery` share the logic more easily.
Test Plan: Browsed Diffusion, ran `diffusion.filecontentquery` to fetch file content.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10423, T11524
Differential Revision: https://secure.phabricator.com/D16458
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