refactor(benchmarks): make setup nicer

- simplify and correct systemjs config
- remove deep imports into Ng2 packages to work with bundles
- have separate Ng2 and Polymer bootstrap files

modules/benchmarks/src/tree/util.ts

@@ -0,0 +1,36 @@
+import {getIntParameter} from '../util';
+
+export class TreeNode {
+  constructor(public value: string, public left: TreeNode, public right: TreeNode) {}
+}
+
+let treeCreateCount: number;
+let maxDepth: number;
+let numberData: string[];
+let charData: string[];
+
+init();
+
+function init() {
+  maxDepth = getIntParameter('depth');
+  treeCreateCount = 0;
+  numberData = [];
+  charData = [];
+  for (let i = 0; i < maxDepth; i++) {
+    numberData.push(i.toString());
+    charData.push(String.fromCharCode('A'.charCodeAt(0) + i));
+  }
+}
+
+function _buildTree(values: string[], curDepth: number = 0): TreeNode {
+  if (maxDepth === curDepth) return new TreeNode('', null, null);
+  return new TreeNode(
+      values[curDepth], _buildTree(values, curDepth + 1), _buildTree(values, curDepth + 1));
+}
+
+export const emptyTree = new TreeNode('', null, null);
+
+export function buildTree(): TreeNode {
+  treeCreateCount++;
+  return _buildTree(treeCreateCount % 2 ? numberData : charData);
+}