Add support for row-by-row jpeg encoding

Bug: 713862
Change-Id: I787b7c49662a00b89ae0ef35845dfbd6be3e6fb1
Reviewed-on: https://skia-review.googlesource.com/14641
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
12 files changed