have resources return unique_ptr for stream

Bug: skia:
Change-Id: I649f4435d06704a5a581a481fe3c46b6ec677baf
Reviewed-on: https://skia-review.googlesource.com/26041
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
6 files changed