Bug 1051754 - B2G NFC: Add marionette test for peer.sendFile. r=dimi

From 3cfb06874b6e838ad76e1817c7b69df81e0f802b Mon Sep 17 00:00:00 2001
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 dom/nfc/tests/marionette/head.js                   | 20 +++++++--
 dom/nfc/tests/marionette/manifest.ini              |  1 +
 dom/nfc/tests/marionette/test_nfc_peer_sendFile.js | 49 ++++++++++++++++++++++
 3 files changed, 67 insertions(+), 3 deletions(-)
 create mode 100644 dom/nfc/tests/marionette/test_nfc_peer_sendFile.js