handle odd-index-count in encode/decode

Bug: skia:
Change-Id: Iffb123001a77049c6581f63bbc69c62f241a87f8
Reviewed-on: https://skia-review.googlesource.com/11405
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
2 files changed