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/GrShadowRRectOp.cpp b/src/gpu/ops/GrShadowRRectOp.cpp
index 0237093..fd1e315 100644
--- a/src/gpu/ops/GrShadowRRectOp.cpp
+++ b/src/gpu/ops/GrShadowRRectOp.cpp
@@ -240,7 +240,7 @@
     const char* name() const override { return "ShadowCircularRRectOp"; }
 
 #if GR_TEST_UTILS
-    SkString dumpInfo() const override {
+    SkString onDumpInfo() const override {
         SkString string;
         for (int i = 0; i < fGeoData.count(); ++i) {
             string.appendf(
@@ -251,7 +251,6 @@
                     fGeoData[i].fOuterRadius, fGeoData[i].fUmbraInset,
                     fGeoData[i].fInnerRadius, fGeoData[i].fBlurRadius);
         }
-        string.append(INHERITED::dumpInfo());
         return string;
     }
 #endif