pdl: Move chunk read output to snapshots

I noticed in the previous commit that it was annoying to update the
code by hand. With the snapshots, we can automate this.

Test: atest pdl_tests
(cherry picked from https://android-review.googlesource.com/q/commit:d78d215b5ecdef3d5b3e0456797a8834fd156580)
Merged-In: I9e65a141ed5bd56d2c3bca52835c848d70eac41f
Change-Id: I9e65a141ed5bd56d2c3bca52835c848d70eac41f