[webnfc]: Step 1: Add NavigatorNfc, Nfc and Layout tests.

Source/modules/nfc/Nfc.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef Nfc_h
+#define Nfc_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ActiveDOMObject.h"
+#include "core/frame/DOMWindowProperty.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Nfc final
+    : public GarbageCollectedFinalized<Nfc>
+    , public ScriptWrappable
+    , public ActiveDOMObject
+    , public DOMWindowProperty {
+    DEFINE_WRAPPERTYPEINFO();
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Nfc);
+
+public:
+    Nfc(ExecutionContext*, LocalFrame*);
+    virtual ~Nfc();
+    ScriptPromise requestAdapter(ScriptState*);
+    DECLARE_VIRTUAL_TRACE();
+};
+
+} // namespace blink
+
+#endif // Nfc_h