[webnfc] Add default implementation for nfc mojo service.

device/nfc/nfc_impl.h

Index: device/nfc/nfc_impl.h
diff --git a/device/nfc/nfc_impl.h b/device/nfc/nfc_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..c6b8a4e4bfa3e251379eb34c3c4e56c0acb8cee0
--- /dev/null
+++ b/device/nfc/nfc_impl.h
@@ -0,0 +1,20 @@
+// Copyright 2016 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 DEVICE_NFC_NFC_IMPL_H_
+#define DEVICE_NFC_NFC_IMPL_H_
+
+#include "device/nfc/nfc.mojom.h"
+#include "device/nfc/nfc_export.h"
+
+namespace device {
+
+class NFCImpl {

[ncarter (slow), 2016/04/26 22:28:26]

Question for reilly: should we be calling this NfcImpl or NFCImpl?

There was a chromium-dev thread on this last fall, that suggested we should
prefer the lowercase-style acronyms, at least in new code.
https://groups.google.com/a/chromium.org/d/msg/chromium-dev/k8-ztIrWaUY/hajvv...

[Reilly Grant (use Gerrit), 2016/04/26 22:35:33]

It should be NfcImpl.

+ public:
+  DEVICE_NFC_EXPORT static void Create(mojo::InterfaceRequest<NFC> request);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_NFC_NFC_IMPL_H_