If we swap its arguments, SkTaskGroup::batch() _is_ sk_parallel_for.

tests/PathOpsThreadedCommon.cpp

Index: tests/PathOpsThreadedCommon.cpp
diff --git a/tests/PathOpsThreadedCommon.cpp b/tests/PathOpsThreadedCommon.cpp
index 342b56004950aac00b558d0fa0007cdaf92c1f06..c9a06f0a52bf792cbaa30d05c88a03dc1c7da3da 100644
--- a/tests/PathOpsThreadedCommon.cpp
+++ b/tests/PathOpsThreadedCommon.cpp
@@ -16,7 +16,7 @@ PathOpsThreadedTestRunner::~PathOpsThreadedTestRunner() {
 }
 
 void PathOpsThreadedTestRunner::render() {
-    sk_parallel_for(fRunnables.count(), [&](int i) {
+    SkTaskGroup().batch(fRunnables.count(), [&](int i) {
         fRunnables[i]->run();
     });
 }