Add a GrTextureResolveManager class

Adds a GrTextureResolveManager class and plumbs it through calls to
generate the drawing manager's dependency DAG. This new class is
currently unimplemented, but it wraps GrDrawingManager and will
eventually give limited access to functionality for making new tasks
that regenerate mipmaps and/or resolve MSAA. We will use this object
to move mipmap generation up to the DAG/proxy level.

Bug: skia:
Change-Id: Ie1deef21e7ae579a0262f2eeb93d451f0740d823
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/232633
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
10 files changed