Adding Angular and dependent packages for testing

third_party/pkg/js/example/twitter/twitter.dart

Index: third_party/pkg/js/example/twitter/twitter.dart
diff --git a/third_party/pkg/js/example/twitter/twitter.dart b/third_party/pkg/js/example/twitter/twitter.dart
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// A JS interop sample showing JSONP access to Twitter from Dart.
+
+import 'dart:html';
+import 'package:js/js.dart' as js;
+
+void main() {
+  // Create a JavaScript function called display that forwards to the Dart
+  // function.
+  js.context.display = display;
+
+  // Inject a JSONP request to Twitter invoking the JavaScript display
+  // function.
+  document.body.nodes.add(new ScriptElement()..src =
+    "https://search.twitter.com/search.json?q=dartlang&rpp=20&callback=display");
+}
+
+// Convert URLs in the text to links.
+String linkify(String text) {
+  List words = text.split(' ');
+  var buffer = new StringBuffer();
+  for (var word in words) {
+    if (!buffer.isEmpty) buffer.write(' ');
+    if (word.startsWith('http://') || word.startsWith('https://')) {
+      buffer.write('<a href="$word">$word</a>');
+    } else {
+      buffer.write(word);
+    }
+  }
+  return buffer.toString();
+}
+
+// Display the JSON data on the web page.
+// Note callbacks are automatically executed within a scope.
+void display(var data) {
+  // The data and results objects are proxies to JavaScript object.
+  var results = data.results;
+  int length = results.length;
+
+  for (int i = 0; i < length; ++i) {
+    var result = results[i];
+    String user = result.from_user_name;
+    String text = linkify(result.text);
+
+    var div = new DivElement()
+      ..innerHtml = '<div>From: $user</div><div>$text</div><p>';
+    document.body.nodes.add(div);
+  }
+}