[webnfc] Add public interfaces.

third_party/WebKit/public/platform/modules/nfc/WebNFCPushTarget.h

Index: third_party/WebKit/public/platform/modules/nfc/WebNFCPushTarget.h
diff --git a/third_party/WebKit/public/platform/modules/nfc/WebNFCPushTarget.h b/third_party/WebKit/public/platform/modules/nfc/WebNFCPushTarget.h
new file mode 100644
index 0000000000000000000000000000000000000000..665f77dfdc161dbff57e8f5384191ccae4f2b42b
--- /dev/null
+++ b/third_party/WebKit/public/platform/modules/nfc/WebNFCPushTarget.h
@@ -0,0 +1,20 @@
+// 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 WebNFCPushTarget_h
+#define WebNFCPushTarget_h
+
+namespace blink {
+
+// Enumeration that is mapped to NFCPushTarget as specified in IDL.
+enum class WebNFCPushTarget {
+    Tag,
+    Peer,
+    Any,
+    ENUM_MAX_VALUE = Any
+};
+
+} // namespace blink
+
+#endif // WebNFCPushTarget_h