Revert "move subrun code to anonymous namespace"

This reverts commit a5eff5d53a8a0e9b5da69820c33a3dffc18aff68.

Reason for revert: b/172455654

Original change's description:
> move subrun code to anonymous namespace
>
> Change-Id: Ic4325a5529ba354c0ce176c4299a9c179f911ff2
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/332136
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Herb Derby <herb@google.com>
> Commit-Queue: Herb Derby <herb@google.com>

TBR=herb@google.com,robertphillips@google.com,reed@google.com

Change-Id: I5601b086ff3dc0a5de85fb427cc01568c67f18ba
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/332541
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Auto-Submit: Derek Sollenberger <djsollen@google.com>
3 files changed