Revert "[CT] Experiment making metrics analysis serial"
Revert "[CT] Experiment making metrics analysis serial"

This reverts commit e2b5478d8dd9068c00e45320e92595065b9f289c.

Reason for revert: Tested

Original change's description:
> [CT] Experiment making metrics analysis serial
> 
> Bug: skia:
> Change-Id: Iddb922cbf5dfc1368059096935e80fbcfaa49244
> Reviewed-on: https://skia-review.googlesource.com/130127
> Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

TBR=benjaminwagner@google.com,9fa2e7438b8cb730f96b74865492597170561628@google.com

Change-Id: Ibed8f6c2259a27a1c43bce920f53bf1933bd006e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/130300
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot