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/src/codec/SkWbmpCodec.cpp b/src/codec/SkWbmpCodec.cpp
index b5fd591..8d4beb1 100644
--- a/src/codec/SkWbmpCodec.cpp
+++ b/src/codec/SkWbmpCodec.cpp
@@ -5,13 +5,15 @@
  * found in the LICENSE file.
  */
 
+#include "SkWbmpCodec.h"
+
 #include "SkCodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorData.h"
 #include "SkColorTable.h"
 #include "SkData.h"
 #include "SkStream.h"
-#include "SkWbmpCodec.h"
+#include "SkTo.h"
 
 // Each bit represents a pixel, so width is actually a number of bits.
 // A row will always be stored in bytes, so we round width up to the