[skottie/ck] Expose logs in JS API

Plumb a JS logger object, and forward errors/warnings to its methods:

  onError(err_str, json_node_str)
  onWarning(wrn_str, json_node_str)

Change-Id: I796aeb313c4a693accafe04edf80178b227ab118
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/370937
Commit-Queue: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
4 files changed