Add WebSocketError to indicate decoding failure reason

net/websockets/websocket_errors.cc

+// Copyright (c) 2012 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.
+
+#include "net/websocket/websocket_errors.h"
+
+namespace net {
+
+Error WebSocketErrorToNetError(WebSocketError error) {
+  switch (error) {
+    case WEB_SOCKET_OK:
+      return OK;
+    case WEB_SOCKET_ERR_PROTOCOL_ERROR:
+      return ERR_WS_PROTOCOL_ERROR;
+    case WEB_SOCKET_ERR_MESSAGE_TOO_BIG:
+      return ERR_MSG_TOO_BIG;
+    default:
+      NOTREACHED();
+  }
+}
+
+}  // namespace net
+
+#endif  // NET_WEBSOCKETS_WEBSOCKET_FRAME_H_