Revert of SkThreadPool ~~> SkTaskGroup

tests/PathOpsTightBoundsTest.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 "PathOpsExtendedTest.h"
 #include "PathOpsThreadedCommon.h"
 #include "SkCanvas.h"
 #include "SkRandom.h"
@@ skipping 17 matching lines @@
             }
         }
         SkRect classicBounds = path.getBounds();
         SkRect tightBounds;
         REPORTER_ASSERT(data->fReporter, TightBounds(path, &tightBounds));
         REPORTER_ASSERT(data->fReporter, classicBounds == tightBounds);
     }
 }
 
 DEF_TEST(PathOpsTightBoundsLines, reporter) {
-    initializeTests(reporter, "tightBoundsLines");
-    PathOpsThreadedTestRunner testRunner(reporter);
+    int threadCount = initializeTests(reporter, "tightBoundsLines");
+    PathOpsThreadedTestRunner testRunner(reporter, threadCount);
     int outerCount = reporter->allowExtendedTest() ? 100 : 1;
     for (int index = 0; index < outerCount; ++index) {
         for (int idx2 = 0; idx2 < 10; ++idx2) {
             *testRunner.fRunnables.append() = SkNEW_ARGS(PathOpsThreadedRunnable,
                     (&testTightBoundsLines, 0, 0, 0, 0, &testRunner));
         }
     }
     testRunner.render();
 }
 
@@ skipping 53 matching lines @@
         }
         if (!bitsWritten.isEmpty()) {
             SkIRect tightOut;
             tightBounds.roundOut(&tightOut);
             REPORTER_ASSERT(data->fReporter, tightOut.contains(bitsWritten));
         }
     }
 }
 
 DEF_TEST(PathOpsTightBoundsQuads, reporter) {
-    initializeTests(reporter, "tightBoundsQuads");
-    PathOpsThreadedTestRunner testRunner(reporter);
+    int threadCount = initializeTests(reporter, "tightBoundsQuads");
+    PathOpsThreadedTestRunner testRunner(reporter, threadCount);
     int outerCount = reporter->allowExtendedTest() ? 100 : 1;
     for (int index = 0; index < outerCount; ++index) {
         for (int idx2 = 0; idx2 < 10; ++idx2) {
             *testRunner.fRunnables.append() = SkNEW_ARGS(PathOpsThreadedRunnable,
                     (&testTightBoundsQuads, 0, 0, 0, 0, &testRunner));
         }
     }
     testRunner.render();
 }