perf: Add performance metrics in Rule.runChecks (#701)

lib/core/base/rule.js

@@ -127,8 +127,11 @@ Rule.prototype.runChecks = function (type, node, options, resolve, reject) {
  * @param  {Function} callback Function to call when evaluate is complete; receives a RuleResult instance
  */
 Rule.prototype.run = function (context, options, resolve, reject) {
+	//jshint maxstatements: 17
 	const q = axe.utils.queue();
 	const ruleResult = new RuleResult(this);
+	const markStart = 'mark_runchecks_start_' + this.id;
+	const markEnd = 'mark_runchecks_end_' + this.id;
 	let nodes;
 
 	try {
@@ -143,6 +146,7 @@ Rule.prototype.run = function (context, options, resolve, reject) {
 
 	if (options.performanceTimer) {
 		axe.log('gather (', nodes.length, '):', axe.utils.performanceTimer.timeElapsed()+'ms');
+		axe.utils.performanceTimer.mark(markStart);
 	}
 
 	nodes.forEach(node => {
@@ -180,6 +184,11 @@ Rule.prototype.run = function (context, options, resolve, reject) {
 		});
 	});
 
+	if (options.performanceTimer) {
+		axe.utils.performanceTimer.mark(markEnd);
+		axe.utils.performanceTimer.measure('runchecks_' + this.id, markStart, markEnd);
+	}
+
 	q.then(() => resolve(ruleResult))
 	.catch(error => reject(error));
 };