[webnfc] Add public interfaces.

third_party/WebKit/public/platform/modules/nfc/WebNFCError.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 WebNFCError_h
+#define WebNFCError_h
+
+namespace blink {
+
+// Errors that may occur during WebNFC execution.

[kenneth.christiansen, 2015/11/30 15:35:50]

...and what they map to.

[shalamov, 2015/12/01 07:57:53]

To the specification.

+enum class WebNFCError {
+    // SecurityError
+    Security,
+    // NotSupportedError
+    NotSupported,
+    DeviceDisabled,
+    // NotFoundError
+    NotFound,
+    // SyntaxError
+    InvalidMessage,
+    // AbortError
+    OperationCancelled,
+    // TimeoutError
+    TimerExpired,
+    // NoModificationAllowedError
+    CannotCancel,
+    // NetworkError
+    IOError,
+
+    ENUM_MAX_VALUE = IOError
+};
+
+} // namespace blink
+
+#endif // WebNFCError_h