function _onRemoteHighlight(event, res) {
        var node;
        if (res.value === "1") {
            node = DOMAgent.nodeWithId(res.nodeId);
        }
        exports.trigger("highlight", node);
    }
HighlightAgent dispatches events for highlight requests from in-browser
highlight requests, and allows highlighting nodes and rules in the browser.

Trigger "highlight" when a node should be highlighted