convert pipe over to serial procs

Bug: skia:
Change-Id: I2c0482dd3ee1d806ff1054c486f73c705bcf2d72
Reviewed-on: https://skia-review.googlesource.com/85042
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
4 files changed