Retract GrSurfaceDrawContext when creating SkGpuDevices

This adds a new SkGpuDevice factory function that absorbs the
creation of the GrSurfaceDrawContext and updates a second factory
function to handle more cases.

Change-Id: If7bd33aa18d1ed5dd72288e7b4db3b97302640cf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/410077
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
11 files changed