Revert "Disable coverage counting by default"

This reverts commit 576b2a5596bc8dda294a069e3fdc6b8b8e48ffcf.

Reason for revert: DDL and MSRTC unhappy

Original change's description:
> Disable coverage counting by default
> 
> Bug: skia:
> Change-Id: Iacb4cb3e409c6abdd25319ec0884ef673fb04cec
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201101
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Chris Dalton <csmartdalton@google.com>

TBR=djsollen@google.com,bsalomon@google.com,csmartdalton@google.com

Change-Id: Iabdb3116d97c7470044b962ff78cffd47ccee744
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201933
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
9 files changed