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/gm/blurrect.cpp b/gm/blurrect.cpp
index a718cde..c2724bd 100644
--- a/gm/blurrect.cpp
+++ b/gm/blurrect.cpp
@@ -5,11 +5,12 @@
 * found in the LICENSE file.
 */
 
-#include "gm.h"
 #include "SkBlurMask.h"
 #include "SkCanvas.h"
 #include "SkMaskFilter.h"
 #include "SkPath.h"
+#include "SkTo.h"
+#include "gm.h"
 
 #define STROKE_WIDTH    SkIntToScalar(10)