1 files changed, 53 insertions, 0 deletions
diff --git a/third_party/webkit/PerformanceTests/Speedometer/resources/todomvc/vanilla-examples/es2015/src/helpers.js b/third_party/webkit/PerformanceTests/Speedometer/resources/todomvc/vanilla-examples/es2015/src/helpers.js
new file mode 100644
index 0000000000..154fc48351
--- /dev/null
+++ b/third_party/webkit/PerformanceTests/Speedometer/resources/todomvc/vanilla-examples/es2015/src/helpers.js
@@ -0,0 +1,53 @@
+'use strict';
+
+
+// Allow for looping on nodes by chaining:
+// qsa('.foo').forEach(function () {})
+NodeList.prototype.forEach = Array.prototype.forEach;
+
+// Get element(s) by CSS selector:
+function qs(selector, scope) {
+    return (scope || document).querySelector(selector);
+}
+
+function qsa(selector, scope) {
+    return (scope || document).querySelectorAll(selector);
+}
+
+// addEventListener wrapper:
+function $on(target, type, callback, useCapture) {
+    target.addEventListener(type, callback, !!useCapture);
+}
+
+// Attach a handler to event for all elements that match the selector,
+// now or in the future, based on a root element
+function $delegate(target, selector, type, handler) {
+    let dispatchEvent = event => {
+        const targetElement = event.target;
+        const potentialElements = qsa(selector, target);
+        const hasMatch = Array.prototype.indexOf.call(potentialElements, targetElement) >= 0;
+
+        if (hasMatch) {
+            handler.call(targetElement, event);
+        }
+    };
+
+    // https://developer.mozilla.org/en-US/docs/Web/Events/blur
+    const useCapture = type === 'blur' || type === 'focus';
+
+    $on(target, type, dispatchEvent, useCapture);
+}
+
+// Find the element's parent with the given tag name:
+// $parent(qs('a'), 'div')
+function $parent(element, tagName) {
+    if (!element.parentNode) {
+        return;
+    }
+
+    if (element.parentNode.tagName.toLowerCase() === tagName.toLowerCase()) {
+        return element.parentNode;
+    }
+
+    return $parent(element.parentNode, tagName);
+}