Add the c++ code part of bindings2/

sky/engine/bindings2/builtin.dart

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+library sky_builtin;
+
+import "dart:async";
+
+// Corelib 'print' implementation.
+void _print(arg) {
+  _Logger._printString(arg.toString());
+}
+
+class _Logger {
+  static void _printString(String s) native "Logger_PrintString";
+}
+
+class _Timer implements Timer {
+  _Timer(int milliseconds,
+         void callback(Timer timer),
+         bool repeating) {
+    _id = _create(milliseconds, () {
+      if (!repeating)
+        _id = 0;
+      callback(this);
+    }, repeating);
+  }
+
+  void cancel() {
+    _cancel(_id);
+    _id = 0;
+  }
+
+  bool get isActive => _id != 0;
+
+  static int _create(int milliseconds,
+                     void callback(),
+                     bool repeating) native "Timer_create";
+  static void _cancel(int id) native "Timer_cancel";
+
+  int _id;
+}
+
+void _scheduleMicrotask(void callback()) native "ScheduleMicrotask";
+Timer _createTimer(int milliseconds,
+                   void callback(Timer timer),
+                   bool repeating) {
+  return new _Timer(milliseconds, callback, repeating);
+}
+
+_getPrintClosure() => _print;
+_getScheduleMicrotaskClosure() => _scheduleMicrotask;
+_getCreateTimerClosure() => _createTimer;