Hmm...I don't work much with motion charts, but I think what you want to be 
testing for is the iconType property.  Something like this, maybe?

google.visualization.events.addListener(chart, 'statechange', function () {
    var state = chart.getState();
    if (state['iconType'] = 'BUBBLE') {
        // change to time
    }
    else if (state['iconType'] = 'VBAR') {
        // change to alphabetical
    }
});

I think that there is another type ('BUBBLE_BAR') that marks the 
transitional state in between the two.

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