Dump batch bounds and scissor rect

src/gpu/batches/GrDiscardBatch.h

Index: src/gpu/batches/GrDiscardBatch.h
diff --git a/src/gpu/batches/GrDiscardBatch.h b/src/gpu/batches/GrDiscardBatch.h
index 3c19b682465797ad75babf65d5aa2b3fadbda0a6..a739f23b7dbbc4ad11ed4cc1ba401ec560238fca 100644
--- a/src/gpu/batches/GrDiscardBatch.h
+++ b/src/gpu/batches/GrDiscardBatch.h
@@ -31,6 +31,7 @@ public:
     SkString dumpInfo() const override {
         SkString string;
         string.printf("RT: %d", fRenderTarget.get()->getUniqueID());
+        string.append(INHERITED::dumpInfo());
         return string;
     }