Adding vs-repeat performance test sample.

res/test/samples/vs-repeat/vs-repeat-controller.js

@@ -0,0 +1,26 @@
+module.exports = function ($scope) {
+  function getArray(size) {
+    var arr = [];
+    for (var i = 0; i < size; i++) {
+      arr.push({
+        a: '',
+        b: ''
+      })
+    }
+    return arr;
+  }
+
+  $scope.$watch('arraySize', function (s) {
+    $scope.bar = getArray(+s);
+  });
+
+  var interval = setInterval(function interval() {
+    var t1 = Date.now();
+    $scope.$digest();
+    $scope.digestDuration = (Date.now() - t1);
+  }, 1000);
+
+  $scope.$on('$destroy', function () {
+    clearInterval(interval);
+  });
+}