nfc: Add native NFC API definitions.

device/nfc/nfc_tag.cc

Index: device/nfc/nfc_tag.cc
diff --git a/tools/gn/script_values.cc b/device/nfc/nfc_tag.cc
similarity index 60%
copy from tools/gn/script_values.cc
copy to device/nfc/nfc_tag.cc
index c5d7989f3f192e343c465a1b9e4c659fc475a6aa..6eec6db1bab33befb4f863dd063ea6843770db2d 100644
--- a/tools/gn/script_values.cc
+++ b/device/nfc/nfc_tag.cc
@@ -2,10 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "tools/gn/script_values.h"
+#include "device/nfc/nfc_tag.h"
 
-ScriptValues::ScriptValues() {
+namespace device {
+
+NfcTag::NfcTag() {
 }
 
-ScriptValues::~ScriptValues() {
+NfcTag::~NfcTag() {
 }
+
+}  // namespace device