Rename D3D descriptor methods to be clearer

Change-Id: I047c4397fba87ce5db6f422162f942ac0ca0b0b9
Bug: skia:10446
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/395816
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
8 files changed