Hide setDrawLooper -- deprecate loopers

Guarded with SK_SUPPORT_LEGACY_DRAWLOOPER

Bug: skia:4783
Change-Id: I4a47513624bc5c09816f44e107917dc8028adb94
Reviewed-on: https://skia-review.googlesource.com/c/189871
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
18 files changed