LayoutTests/webgl/max-active-contexts-gc.html

<script>
function collect() {
    if (window.GCController) {
        GCController.collect();
        return;
    }
    try {
        for (var ndx = 0; ndx < 99000; ndx++)
            var numbers = new Float64Array(50 * 1024);
    } catch (e) { }
}

function addContext() {
    contexts.push(document.createElement("canvas").getContext("webgl"));
}

if (window.testRunner) {
    testRunner.waitUntilDone();
    testRunner.dumpAsText();
}

var maxNumberOfActiveContexts = 16;
var contextsToKeep = 8;
var contexts = [];

// Create the max number of active WebGL contexts.
while (contexts.length < maxNumberOfActiveContexts)
    addContext();

// Now remove some of those contexts from this array so they may be garbage collected.
while (contexts.length > contextsToKeep) {
    contexts.shift();
    collect();
}

// Add contexts until we get to the limit then add one more. This should only
// produce a single warning that an older context will be lost.
setTimeout(function() {
    while (contexts.length < maxNumberOfActiveContexts + 1)
        addContext();
    if (window.testRunner)
        testRunner.notifyDone();
});

</script>