Add SkBaseGpuDevice ...

between SkBaseDevice/SkClipStackDevice and SkGpuDevice/SkGpuDevice_nga

The idea is that SkCanvas will deal with SkBaseGpuDevices rather than SkGpuDevice*s

Change-Id: I1bffeccab44d2a2b73413f50d7c905fa2df8eedc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/407459
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
4 files changed