The google#setOnLoadCallback method accepts a function as a parameter. 
 When you pass "drawVisualization(myData)" to it, it actually executes the 
drawVisualization function and passes the return value to 
#setOnLoadCallback.  What you would need is something like this:

google.setOnLoadCallback(init);

function init () {
    drawVisualization(mydata);
}

Also note that google.visualization might not exist at the time you call it 
unless you call it inside the google load callback function, like this:

function init () {
    var mydata = google.visualization.arrayToDataTable([
        ["Name", "Gender", "Age", "Donuts eaten"],
        ["David", "Male", 34, 20],
        ["Lisa", "Female", 23, 7]
    ]);  

    drawVisualization(mydata);
}

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