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

Source/modules/nfc/NFC.h

Index: Source/modules/nfc/NFC.h
diff --git a/Source/modules/nfc/NFC.h b/Source/modules/nfc/NFC.h
new file mode 100644
index 0000000000000000000000000000000000000000..79c8a1694835489e481238a1603e96eecc266ade
--- /dev/null
+++ b/Source/modules/nfc/NFC.h
@@ -0,0 +1,34 @@
+// 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*);

[Jeffrey Yasskin, 2015/08/18 17:48:59]

If you only intend to create NFC objects using NFC::Create, you should make the
other constructor private.

[riju_, 2015/08/19 08:41:22]

Done.

+    static NFC* create(ExecutionContext*, LocalFrame*);
+    virtual ~NFC();

[Jeffrey Yasskin, 2015/08/18 17:48:59]

We generally write "~NFC() override;" for overriding virtual functions. Although
you can just leave this out for now since it's empty.

[riju_, 2015/08/19 08:41:22]

Acknowledged.

[Jeffrey Yasskin, 2015/08/19 16:40:04]

Oh, I meant you can probably delete ~NFC() entirely. If you keep it, it should
be marked override.

+    ScriptPromise requestAdapter(ScriptState*);

[Jeffrey Yasskin, 2015/08/18 17:48:59]

Comment which parts of the interface are IDL-exposed vs which are for the C++
code. e.g.
https://code.google.com/p/chromium/codesearch/#chromium/src/third_party/WebKi...

[riju_, 2015/08/19 08:41:22]

Done.

+    DECLARE_VIRTUAL_TRACE();
+};
+
+} // namespace blink
+
+#endif // NFC_h