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>
diff --git a/src/gpu/ops/GrAtlasTextOp.cpp b/src/gpu/ops/GrAtlasTextOp.cpp
index a0265c8..4054121 100644
--- a/src/gpu/ops/GrAtlasTextOp.cpp
+++ b/src/gpu/ops/GrAtlasTextOp.cpp
@@ -93,7 +93,7 @@
 }
 
 #if GR_TEST_UTILS
-SkString GrAtlasTextOp::dumpInfo() const {
+SkString GrAtlasTextOp::onDumpInfo() const {
     SkString str;
 
     for (int i = 0; i < fGeoCount; ++i) {
@@ -105,7 +105,6 @@
     }
 
     str += fProcessors.dumpProcessors();
-    str += INHERITED::dumpInfo();
     return str;
 }
 #endif