Revert "Update skpbench to let the gpu thread run alongside the recording threads"

This reverts commit ca06ce48f174883ead3782383cd11d4c131ab4ce.

Reason for revert: It is dying on a bot with the error:
skpbench.py: error: unrecognized arguments: --ddlNumRecordingThreads c:\b\s\w\ir\skp

Original change's description:
> Update skpbench to let the gpu thread run alongside the recording threads
> 
> Bug: skia:10176
> Change-Id: Ibadd52b86abfd2802b9b3f31c86ab573554601db
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/289883
> Commit-Queue: Adlai Holler <adlai@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

TBR=robertphillips@google.com,adlai@google.com

Change-Id: Iec316410563f0fe1d06f44bcfa58f6790c547f98
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:10176
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/290117
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
3 files changed