Reland "Initiate regeneration of mipmaps from proxy DAG land"

This is a reland of fe19203eb7d7e8bef528287494d82c2eb4efff0e

Original change's description:
> Initiate regeneration of mipmaps from proxy DAG land
> 
> This allows us to resolve all the textures before executing a command
> buffer, rather than interrupting execution as is currently done in the
> GL backend.
> 
> Change-Id: I998546b312d24cf47fc2c837e7c94fbf95571af0
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/230636
> Commit-Queue: Chris Dalton <csmartdalton@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

Change-Id: Ic904d0b1bcb451bcb74cfae2204fb7297eaff108
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/234016
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
15 files changed