Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/core_dom/node_cursor.dart

Index: third_party/pkg/angular/lib/core_dom/node_cursor.dart
diff --git a/third_party/pkg/angular/lib/core_dom/node_cursor.dart b/third_party/pkg/angular/lib/core_dom/node_cursor.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b95a2e81617da0b8b8345df4bb6d2d790ebd18e1
--- /dev/null
+++ b/third_party/pkg/angular/lib/core_dom/node_cursor.dart
@@ -0,0 +1,96 @@
+part of angular.core.dom;
+
+class NodeCursor {
+  List<dynamic> stack = [];
+  List<dom.Node> elements;
+  num index;
+
+  NodeCursor(this.elements) : index = 0;
+
+  isValid() => index < elements.length;
+
+  cursorSize() => 1;
+
+  macroNext() {
+    for(var i = 0, ii = cursorSize(); i < ii; i++, index++){}
+
+    return this.isValid();
+  }
+
+  microNext() {
+    var length = elements.length;
+
+    if (index < length) {
+      index++;
+    }
+
+    return index < length;
+  }
+
+  nodeList() {
+    if (!isValid()) return [];  // or should we return null?
+
+    var nodes = [];
+
+    for(var i = 0, ii = cursorSize(); i < ii; i++) {
+      nodes.add(elements[index + i]);
+    }
+
+    return nodes;
+  }
+
+  descend() {
+    var childNodes = elements[index].nodes;
+    var hasChildren = !!(childNodes != null && childNodes.length > 0);
+
+    if (hasChildren) {
+      stack.add(index);
+      stack.add(elements);
+      elements = new List.from(childNodes);
+      index = 0;
+    }
+
+    return hasChildren;
+  }
+
+  ascend() {
+    elements = stack.removeLast();
+    index = stack.removeLast();
+  }
+
+  insertAnchorBefore(String name) {
+    var current = elements[index];
+    var parent = current.parentNode;
+
+    var anchor = new dom.Comment('ANCHOR: $name');
+
+    elements.insert(index++, anchor);
+
+    if (parent != null) {
+      parent.insertBefore(anchor, current);
+    }
+  }
+
+  replaceWithAnchor(String name) {
+    insertAnchorBefore(name);
+    var childCursor = remove();
+    this.index--;
+    return childCursor;
+  }
+
+  remove() {
+    var nodes = nodeList();
+
+    for (var i = 0, ii = nodes.length; i < ii; i++) {
+      // NOTE(deboer): If elements is a list of child nodes on a node, then
+      // calling Node.remove() may also remove it from the list.  Thus, we
+      // call elements.removeAt first so only one node is removed.
+      elements.removeAt(index);
+      nodes[i].remove();
+    }
+
+    return new NodeCursor(nodes);
+  }
+
+  isInstance() => false;
+}