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

tools/threadpool/Runnable.h

Index: tools/threadpool/Runnable.h
diff --git a/include/utils/SkRunnable.h b/tools/threadpool/Runnable.h
similarity index 55%
rename from include/utils/SkRunnable.h
rename to tools/threadpool/Runnable.h
index 5acf4dbc61a4ec4f177c14cf594dc3274c50a26a..6ddc95ba2fc07ec7299d9a67892cb766ec78b622 100644
--- a/include/utils/SkRunnable.h
+++ b/tools/threadpool/Runnable.h
@@ -5,21 +5,21 @@
  * found in the LICENSE file.
  */
 
-#ifndef SkRunnable_DEFINED
-#define SkRunnable_DEFINED
+#ifndef Runnable_DEFINED
+#define Runnable_DEFINED
 
 template <typename T>
-struct SkTRunnable {
-    virtual ~SkTRunnable() {};
+struct TRunnable {
+    virtual ~TRunnable() {};
     virtual void run(T&) = 0;
 };
 
 template <>
-struct SkTRunnable<void> {
-    virtual ~SkTRunnable() {};
+struct TRunnable<void> {
+    virtual ~TRunnable() {};
     virtual void run() = 0;
 };
 
-typedef SkTRunnable<void> SkRunnable;
+typedef TRunnable<void> Runnable;
 
 #endif