[androidkit] add gaussian blur filter to java ImageFilters

Change-Id: I63f3f3feaf590971633c88857105ed14dbab2bb8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/420122
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
5 files changed