Update createWrappedRenderTargetProxy with BackendTex to use lazy proxies

Bug: skia:
Change-Id: I5a5519aebe544cb5ef62e9847c3fa4e218f24aea
Reviewed-on: https://skia-review.googlesource.com/108561
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed