inspector: print warning when used

This is done to note that this is an experimental feature.

PR-URL: #7383
Reviewed-By: Myles Borins <[email protected]>
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: evanlucas

src/inspector_agent.cc

@@ -36,6 +36,7 @@ const char DEVTOOLS_HASH[] = "521e5b7e2b7cc66b4006a8a54cb9c4e57494a5ef";
 
 void PrintDebuggerReadyMessage(int port) {
   fprintf(stderr, "Debugger listening on port %d.\n"
+    "Warning: This is an experimental feature and could change at any time.\n"
     "To start debugging, open the following URL in Chrome:\n"
     "    chrome-devtools://devtools/remote/serve_file/"
     "@%s/inspector.html?"