As always after posting, I found a solution which works:

// worker.js
var wp = google.gears.workerPool;
wp.onmessage = function(messageText, senderId, message)
{
    if (messageText == "init") {
        init(senderId);
    }
}

function init(parentId)
{
    var i = 0;
    var x = 100000000;

    for (i = 0, percent = 0; i < x; ++i) {
        if (i % (x / 100) == 0) {
            wp.sendMessage(percent + "%", parentId);
            ++percent;
        }
    }
    wp.sendMessage("complete", parentId);
}

// main.js:
// [..]
workerPool.sendMessage("init", childWorkerId);
// [..]

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