Reduce use of SkImage_Base::peekTexture

Change-Id: I079093c9706df4911d47fba04b786e59240e8cb4
Reviewed-on: https://skia-review.googlesource.com/7792
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
9 files changed