Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/perf/dev_tools_timeline.dart

+part of angular.perf;
+
+class DevToolsTimelineProfiler extends Profiler {
+  final dom.Console console = dom.window.console;
+  String prefix = '';
+
+  int startTimer(String name, [String extraData]) {
+    console.time('$prefix$name');
+    prefix = '$prefix  ';
+  }
+
+  void stopTimer(dynamic name) {
+    prefix = prefix.length > 0 ? prefix.substring(0, prefix.length - 2) : prefix;
+    console.timeEnd('$prefix$name');
+  }
+
+  void markTime(String name, [String extraData]) {
+    console.timeStamp('$prefix$name');
+  }
+}