Move threadpool code from include/utils to tools/threadpool.

tests/PathOpsExtendedTest.cpp

Index: tests/PathOpsExtendedTest.cpp
diff --git a/tests/PathOpsExtendedTest.cpp b/tests/PathOpsExtendedTest.cpp
index fe3d24d6a09b27d88f753144d6d750061c80a8f7..2ba21899e1967f2523a58975c020163fc80521e9 100644
--- a/tests/PathOpsExtendedTest.cpp
+++ b/tests/PathOpsExtendedTest.cpp
@@ -15,7 +15,7 @@
 #include "SkRTConf.h"
 #include "SkStream.h"
 #include "SkThread.h"
-#include "SkThreadPool.h"
+#include "ThreadPool.h"
 
 #ifdef SK_BUILD_FOR_MAC
 #include <sys/sysctl.h>
@@ -695,7 +695,7 @@ int initializeTests(skiatest::Reporter* reporter, const char* test) {
             }
         }
     }
-    return reporter->allowThreaded() ? SkThreadPool::kThreadPerCore : 1;
+    return reporter->allowThreaded() ? ThreadPool::kThreadPerCore : 1;
 }
 
 void outputProgress(char* ramStr, const char* pathStr, SkPath::FillType pathFillType) {