Have SkImage_Base send out UniqueKey invalidations to GPU backend when destroyed.

This CL currently only adds invalidation messages for texture proxies created
through SkImage_Lazy.

Bug: skia:
Change-Id: I7f53e5b4d40e9fdb4941edc80656c86690e4e4a9
Reviewed-on: https://skia-review.googlesource.com/152323
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed