This reverts commit 873a39ebd1.
Reason for revert: rework #2 of trace design, DebugTrace is back
Original change's description:
> Remove newly-added SkSL::DebugTrace base class.
>
> Slight rework of the SkRuntimeEffect trace design means we won't expose
> any debug-trace class at the public level, so an interface base class
> doesn't add value after all.
>
> Change-Id: I82739e9c5ba5ce5c7a63793ec0c09a50ab19fbb3
> Bug: skia:12708
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/480776
> Auto-Submit: John Stiles <johnstiles@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>
Bug: skia:12708
Change-Id: I02d51f83c7a3384b1eaa74ecf1a80b5f6e4fd774
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/481196
Auto-Submit: John Stiles <johnstiles@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
5fb4753483