refactor(perf): e2e tests and benchpress should be written in es6

modules/benchmarks_external/e2e_test/tree_perf.es6

@@ -0,0 +1,36 @@
+"use strict";
+var benchpress = require('../../../tools/benchpress/index.js');
+
+describe('ng1.x tree benchmark', function () {
+
+  var URL = 'benchmarks_external/web/tree/tree_benchmark.html';
+
+  afterEach(benchpress.verifyNoBrowserErrors);
+
+  it('should log the stats', function() {
+    browser.get(URL);
+    runClickTimeBenchmark({
+      buttons: ['#destroyDom', '#createDom'],
+      logId: 'ng1.tree'
+    });
+  });
+
+});
+
+function runClickTimeBenchmark(config) {
+  var buttons = config.buttons.map(function(selector) {
+    return $(selector);
+  });
+  var timeParams = browser.params.timeBenchmark;
+  benchpress.runTimeBenchmark({
+    sampleSize: timeParams.sampleSize,
+    targetCoefficientOfVariation: timeParams.targetCoefficientOfVariation,
+    timeout: timeParams.timeout,
+    metrics: timeParams.metrics,
+    logId: browser.params.lang+'.'+config.logId
+  }, function() {
+    buttons.forEach(function(button) {
+      button.click();
+    });
+  });
+}