<script>
if (window.testRunner)
    testRunner.dumpAsText();

function callback() {
    if (window.GCController)
        return GCController.collect();

    // Force garbage collection
    for (let i=0; i < 100; i++)
        var a = new Uint8Array(1024*1024);
}

function run() {
   var c = document.createElement("canvas");
   c.toBlob(callback);
   var ctx = c.getContext("bitmaprenderer");
}

window.addEventListener("load", run, false);
</script>
Should not crash.