Ensure that GrGpu state tracking is initialized before making a backend RT/Tex in tests

Change-Id: Ie5692d97678705306f514d5911bf331f784e7a40
Reviewed-on: https://skia-review.googlesource.com/114288
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed