Add a method to convert SkCodec::Result to a string

Bug: b/63909536
Change-Id: Ic91e3401359f80eadd9d1cd79aa8ef642c60b0fc
Reviewed-on: https://skia-review.googlesource.com/94781
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
2 files changed