Update ColorFilter API to be backed by mutable native objects

Move the native ColorFilter implementation off of Skia's
SkColorFilter and instead have a mutable intermediate object
that can be inspected.

Bug: 264559422
Test: re-ran CtsUiRenderingTestCases
Change-Id: I9ec056084f00e72632c86bdf88376b1307e8ef74
10 files changed