support assets for skottie2movie

Change-Id: Icb66c9cf4eb2db72997b566fe863dab21d2824ef
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/216871
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index ba2a6e5..32140b8 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1927,6 +1927,7 @@
         ":skia",
         ":video_decoder",
         "modules/skottie",
+        "modules/skottie:utils",
       ]
     }
   }