base1: Log any "message" field in "close" control messages
base1: Log any "message" field in "close" control messages

Log any "message" field in "close" control messages to the
console.warn() in the browser.

This is similar to how a GTK+ app has a textual console
where you can see log messages.

Reviewed-by: Peter <a316049dd34607c62d4611d63ab22a6454add223@redhat.com>

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