Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/mock/debug.dart

+part of angular.mock;
+
+String depth = '';
+
+ENTER(name) {
+  dump('${depth}ENTER: $name');
+  depth = depth +  '  ';
+}
+
+LEAVE(name) {
+  depth = depth.substring(0, depth.length -2);
+  dump('${depth}LEAVE: $name');
+}
+
+MARK(name) {
+  dump('$depth$name');
+}
+
+
+dump([p1, p2, p3, p4, p5, p6, p7, p8, p9, p10]) {
+  var log = [];
+  if (p1 != null) log.add(STRINGIFY(p1));
+  if (p2 != null) log.add(STRINGIFY(p2));
+  if (p3 != null) log.add(STRINGIFY(p3));
+  if (p4 != null) log.add(STRINGIFY(p4));
+  if (p5 != null) log.add(STRINGIFY(p5));
+  if (p6 != null) log.add(STRINGIFY(p6));
+  if (p7 != null) log.add(STRINGIFY(p7));
+  if (p8 != null) log.add(STRINGIFY(p8));
+  if (p9 != null) log.add(STRINGIFY(p9));
+  if (p10 != null) log.add(STRINGIFY(p10));
+ (js.context as dynamic).console.log(log.join(', '));
+}
+
+STRINGIFY(obj) {
+  if (obj is List) {
+    var out = [];
+    obj.forEach((i) => out.add(STRINGIFY(i)));
+    return '[${out.join(", ")}]';
+  } else if (obj is Comment) {
+    return '<!--${obj.text}-->';
+  } else if (obj is Element) {
+    return obj.outerHtml;
+  } else if (obj is String) {
+    return '"$obj"';
+  } else {
+    return obj.toString();
+  }
+}