Revert "Revert "SkTypes: extract SkTo""

This reverts commit fdcfb8b7c23fbf18f872d2c31d27978235033876.

> Original change's description:
> > SkTypes: extract SkTo
> >
> > Change-Id: I8de790d5013db2105ad885fa2683303d7c250b09
> > Reviewed-on: https://skia-review.googlesource.com/133620
> > Reviewed-by: Mike Klein <mtklein@google.com>

Change-Id: Ida74fbc5c21248a724a5edbf9fae18a33bcb23aa
Reviewed-on: https://skia-review.googlesource.com/134506
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/tests/PathTest.cpp b/tests/PathTest.cpp
index 565e8d8..30d27c1 100644
--- a/tests/PathTest.cpp
+++ b/tests/PathTest.cpp
@@ -21,10 +21,11 @@
 #include "SkStream.h"
 #include "SkStrokeRec.h"
 #include "SkSurface.h"
+#include "SkTo.h"
 #include "SkWriter32.h"
 #include "Test.h"
-#include <cmath>
 
+#include <cmath>
 
 static void set_radii(SkVector radii[4], int index, float rad) {
     sk_bzero(radii, sizeof(SkVector) * 4);