add makeShader() to SkBitmap, and deprecate SkShader version

Bug: skia:8937
Change-Id: I42f011e04937a751222bd8ecc6c69b45cf9626a2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206681
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
64 files changed