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>
25 files changed