Revert of SkThreadPool ~~> SkTaskGroup

tests/PathOpsThreadedCommon.cpp

Index: tests/PathOpsThreadedCommon.cpp
diff --git a/tests/PathOpsThreadedCommon.cpp b/tests/PathOpsThreadedCommon.cpp
index 0adde915e0870fbbea6205b80f477e6cf82f9578..ac4cd6ba62614f7623f0abc6e971c13dd34a0b00 100644
--- a/tests/PathOpsThreadedCommon.cpp
+++ b/tests/PathOpsThreadedCommon.cpp
@@ -7,7 +7,7 @@
 
 #include "PathOpsExtendedTest.h"
 #include "PathOpsThreadedCommon.h"
-#include "SkTaskGroup.h"
+#include "SkThreadPool.h"
 
 PathOpsThreadedTestRunner::~PathOpsThreadedTestRunner() {
     for (int index = 0; index < fRunnables.count(); index++) {
@@ -16,8 +16,8 @@
 }
 
 void PathOpsThreadedTestRunner::render() {
-    SkTaskGroup tg;
+    SkThreadPool pool(fNumThreads);
     for (int index = 0; index < fRunnables.count(); ++ index) {
-        tg.add(fRunnables[index]);
+        pool.add(fRunnables[index]);
     }
 }