This change adds mock ups of the interfaces that we've been designing as
part of Razor FAR as well as the implementations. This isn't wired up to
anything yet in this PR, but the basic functionality here is stable
enough for us to stabilize and review.
For now we have the interface definitions in the Razor codebase until a
build of Roslyn is available with these definitions + IVT for us to use
them.
This builds support for tracking the effect of changes to imports on
other documents, and completes our model for being able to keep
generated code up to date.
- Prior to this we had a `BackgroundDocumentGenerator` that would constantly be updating generated code containers. With this changes we've changed the details in how a `GeneratedCodeContainer` can be mutated. It can now be touched from any thread and is updated when an underlying `DocumentSnapshot` has available content. However, if a generated output comes through that's older then the last seen output we no-op.
- Removed `BackgroundDocumentGenerator` SetOutput logic.
- Updated tests to react to new behavior of `GetGeneratedOutputAsync`.
- Added new test to verify getting generated output results in the setting of the host documents output.
Ryan Nowak
N. Taylor Mullen