Add `GrProcessor::onDumpInfo` for subclass info dumps.

This CL also marks `GrProcessor::dumpInfo` as final. This prevents a
subclass from mistakenly overriding `dumpInfo` instead of `onDumpInfo`.

`onDumpInfo` is responsible for providing the same data as `dumpInfo`,
except that the FP name is automatically prepended.

Change-Id: I2b44c30a01bc65e9d88321cc21651a94e20074c6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/309793
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/effects/generated/GrEllipseEffect.cpp b/src/gpu/effects/generated/GrEllipseEffect.cpp
index 7e9bd01..ee9ce65 100644
--- a/src/gpu/effects/generated/GrEllipseEffect.cpp
+++ b/src/gpu/effects/generated/GrEllipseEffect.cpp
@@ -162,8 +162,8 @@
     return std::make_unique<GrEllipseEffect>(*this);
 }
 #if GR_TEST_UTILS
-SkString GrEllipseEffect::dumpInfo() const {
-    return SkStringPrintf("EllipseEffect(edgeType=%d, center=float2(%f, %f), radii=float2(%f, %f))",
+SkString GrEllipseEffect::onDumpInfo() const {
+    return SkStringPrintf("(edgeType=%d, center=float2(%f, %f), radii=float2(%f, %f))",
                           (int)edgeType, center.fX, center.fY, radii.fX, radii.fY);
 }
 #endif