Handle static/single frame images in SkAnimCodecPlayer

Bug: skia:
Change-Id: I9fae9b56133e7de877021e846dbc431c69477113
Reviewed-on: https://skia-review.googlesource.com/c/168900
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
4 files changed