[codesize] Add skottie_tool and -Oz to compile flags

Change-Id: Ia059e8e215bd46dd4aac5b5b509fe73a19a5c051
Bug: skia:12151
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/548296
Reviewed-by: Brian Osman <brianosman@google.com>
5 files changed