Revert "Revert "Mark wrapped textures imported into SkImages as "read only".""

This reverts commit ff4ccaa9fcfbcf29c476eda973febf4b2d6dc974.

Bug: skia:8509
Change-Id: If4a059d6e6e412ec1d6be2c70663d59c362e91d2
Reviewed-on: https://skia-review.googlesource.com/c/175249
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
54 files changed