Migrate debugger & canvaskit to GrDirectContext

Change-Id: I57e0b28da89870cd9c7708283b64613368008c54
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327158
Commit-Queue: Adlai Holler <adlai@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
4 files changed