Update GrOp subclasses to use `onDumpInfo` for info dumping.

This is meant to parallel the changes in http://review.skia.org/309793,
but for GrOps. The base-class info is automatically appended without
subclasses manually calling `append(INHERITED::dumpInfo())`.

Change-Id: Ic815305feeeca07385687af5703f0dd88a008f9f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/309879
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
24 files changed