Fix skottie_tool build

Should be guarded by the Skottie build flag.

Change-Id: I4e895a3759d19248fe0770dce710a0ef78c780b7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/417007
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
Auto-Submit: Florin Malita <fmalita@chromium.org>
1 file changed