Reland "Revert "Use ManagedBackendTexture in place of TestUtils backend texture helpers.""

This reverts commit 21f8b5109951b16ff327f39072d7b5b141ac5c09.

Reason for revert: D3D traced resource assert from unit test

Original change's description:
> Revert "Revert "Use ManagedBackendTexture in place of TestUtils backend texture helpers.""
>
> This reverts commit f625e4ce4504facbf0cfa210f8d9770b8431cdd9.
>
> Change-Id: Id73c53ec7ab8d4a5951712dc150d86e6349addbf
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/325658
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

TBR=egdaniel@google.com,bsalomon@google.com

# Not skipping CQ checks because this is a reland.

Change-Id: I407f1d522d5c4f28d070cc2ce87af7faffca11fd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/325860
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
25 files changed