Move SkTemplates.h to private.

SkTemplates.h contains a number of Skia specific utilities which are
not designed for external use. In addition to reducing the external
support burden, this will allow Skia to freely refactor this file.

Review URL: https://codereview.chromium.org/1272293004
diff --git a/src/core/SkBitmapController.cpp b/src/core/SkBitmapController.cpp
index c8164a3..fb54388 100644
--- a/src/core/SkBitmapController.cpp
+++ b/src/core/SkBitmapController.cpp
@@ -8,6 +8,7 @@
 #include "SkBitmap.h"
 #include "SkBitmapController.h"
 #include "SkMatrix.h"
+#include "SkTemplates.h"
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////