SkThreadPool and co. are not public.

include/utils/SkRunnable.h

Index: include/utils/SkRunnable.h
diff --git a/include/utils/SkRunnable.h b/include/utils/SkRunnable.h
deleted file mode 100644
index 5acf4dbc61a4ec4f177c14cf594dc3274c50a26a..0000000000000000000000000000000000000000
--- a/include/utils/SkRunnable.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkRunnable_DEFINED
-#define SkRunnable_DEFINED
-
-template <typename T>
-struct SkTRunnable {
-    virtual ~SkTRunnable() {};
-    virtual void run(T&) = 0;
-};
-
-template <>
-struct SkTRunnable<void> {
-    virtual ~SkTRunnable() {};
-    virtual void run() = 0;
-};
-
-typedef SkTRunnable<void> SkRunnable;
-
-#endif