[skottie] GM exercising external font loading

Sets up a fake web font loader which serves a local/resource font to
the sample text animation.

Also rename resources/skotty/skotty_* -> resources/skottie/skottie_*.

Change-Id: I4af5b24fc3cc5c63c78801979f9be56744047134
Reviewed-on: https://skia-review.googlesource.com/155881
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
5 files changed