Bring back PerCommit-Bookmaker to the waterfall

NoTry: true
Bug: skia:
Change-Id: I67f3cfe516cee4db22efecf4ac910c4c88be5552
Reviewed-on: https://skia-review.googlesource.com/c/192402
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
2 files changed