Move GrTypesPriv.h to include/private

Bug: skia:
Change-Id: I68610fed67a70454a815229c47b78ea6d9463a43
Reviewed-on: https://skia-review.googlesource.com/24624
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index dba90bf..ae7d991 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -24,7 +24,6 @@
   "$_include/gpu/GrTexture.h",
   "$_include/gpu/GrSamplerParams.h",
   "$_include/gpu/GrTypes.h",
-  "$_include/gpu/GrTypesPriv.h",
 
   "$_include/gpu/gl/GrGLAssembleInterface.h",
   "$_include/gpu/gl/GrGLConfig.h",
@@ -42,6 +41,7 @@
   "$_include/private/GrSurfaceProxy.h",
   "$_include/private/GrSwizzle.h",
   "$_include/private/GrTextureProxy.h",
+  "$_include/private/GrTypesPriv.h",
 
   "$_src/gpu/GrAppliedClip.h",
   "$_src/gpu/GrAuditTrail.cpp",