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

src/core/SkMultiPictureDraw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // Need to include something before #if SK_SUPPORT_GPU so that the Android
 // framework build, which gets its defines from SkTypes rather than a makefile,
 // has the definition before checking it.
@@ skipping 76 matching lines @@
 //#define FORCE_SINGLE_THREAD_DRAWING_FOR_TESTING
 
 void SkMultiPictureDraw::draw(bool flush) {
     AutoMPDReset mpdreset(this);
 
 #ifdef FORCE_SINGLE_THREAD_DRAWING_FOR_TESTING
     for (int i = 0; i < fThreadSafeDrawData.count(); ++i) {
         fThreadSafeDrawData[i].draw();
     }
 #else
-    sk_parallel_for(fThreadSafeDrawData.count(), [&](int i) {
+    SkTaskGroup().batch(fThreadSafeDrawData.count(), [&](int i) {
         fThreadSafeDrawData[i].draw();
     });
 #endif
 
     // N.B. we could get going on any GPU work from this main thread while the CPU work runs.
     // But in practice, we've either got GPU work or CPU work, not both.
 
     const int count = fGPUDrawData.count();
     if (0 == count) {
         return;
@@ skipping 90 matching lines @@
         }
     }
 
 #if !defined(SK_IGNORE_GPU_LAYER_HOISTING) && SK_SUPPORT_GPU
     GrLayerHoister::UnlockLayers(context, atlasedNeedRendering);
     GrLayerHoister::UnlockLayers(context, atlasedRecycled);
     GrLayerHoister::End(context);
 #endif
 }