Move GrRecordingContext pointer to SkBaseGpuDevice

Both SkGpuDevice and SkGpuDevice_nga have this pointer so, share it.

Change-Id: Iafabc51c344d9bdaead0a645ec54aec83fa508d2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/414441
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
5 files changed