SkTypes: extract SkTo

Change-Id: I8de790d5013db2105ad885fa2683303d7c250b09
Reviewed-on: https://skia-review.googlesource.com/133620
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/include/private/SkTDArray.h b/include/private/SkTDArray.h
index b030dc5..dd3212d 100644
--- a/include/private/SkTDArray.h
+++ b/include/private/SkTDArray.h
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2006 The Android Open Source Project
  *
@@ -10,8 +9,9 @@
 #ifndef SkTDArray_DEFINED
 #define SkTDArray_DEFINED
 
-#include "SkTypes.h"
 #include "SkMalloc.h"
+#include "SkTo.h"
+#include "SkTypes.h"
 
 template <typename T> class SkTDArray {
 public: