Make room for shifting GrContext to GrDirectContext

Change-Id: I6291b0c513c641c3bb49260031b501da42b11ede
Reviewed-on: https://skia-review.googlesource.com/c/190002
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed