SkTypes: extract SkTo

Change-Id: I8de790d5013db2105ad885fa2683303d7c250b09
Reviewed-on: https://skia-review.googlesource.com/133620
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/src/xml/SkXMLParser.cpp b/src/xml/SkXMLParser.cpp
index 23c4e67..36e1ab3 100644
--- a/src/xml/SkXMLParser.cpp
+++ b/src/xml/SkXMLParser.cpp
@@ -5,12 +5,14 @@
  * found in the LICENSE file.
  */
 
+#include "SkXMLParser.h"
+
 #include "expat.h"
 
 #include "SkStream.h"
 #include "SkString.h"
+#include "SkTo.h"
 #include "SkTypes.h"
-#include "SkXMLParser.h"
 
 static char const* const gErrorStrings[] = {
     "empty or missing file ",