Add srcData version of createBackendTexture API

Change-Id: I9679774d69e087a4ceb24de78e98585382bf8593
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/218553
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
11 files changed