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

tests/SkpSkGrTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrContext.h"
 #include "GrContextFactory.h"
 #include "GrRenderTarget.h"
@@ skipping 153 matching lines @@
 
 SkpSkGrThreadedTestRunner::~SkpSkGrThreadedTestRunner() {
     for (int index = 0; index < fRunnables.count(); index++) {
         delete fRunnables[index];
     }
 }
 
 void SkpSkGrThreadedTestRunner::render() {
     // TODO: we don't really need to be using SkRunnables here anymore.
     // We can just write the code we'd run right in the for loop.
-    sk_parallel_for(fRunnables.count(), [&](int i) {
+    SkTaskGroup().batch(fRunnables.count(), [&](int i) {
         fRunnables[i]->run();
     });
 }
 
 ////////////////////////////////////////////////
 
 static const char outGrDir[] = OUT_DIR "grTest";
 static const char outSkDir[] = OUT_DIR "skTest";
 static const char outSkpDir[] = OUT_DIR "skpTest";
 static const char outDiffDir[] = OUT_DIR "outTest";
@@ skipping 566 matching lines @@
     int testIndex = 166;
     int dirIndex = skipOverSkGr[testIndex - 166].directory;
     SkString pictDir = make_in_dir_name(dirIndex);
     if (pictDir.size() == 0) {
         return;
     }
     SkString filename(skipOverSkGr[testIndex - 166].filename);
     TestResult::Test(dirIndex, filename.c_str(), kCompareBits, reporter->verbose());
     TestResult::Test(dirIndex, filename.c_str(), kEncodeFiles, reporter->verbose());
 }