Move internals.dart out of Sky SDK

sky/engine/bindings/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);
-}
-
-String _getBaseURLString() native "GetBaseURLString";
-Uri _getBaseURL() => Uri.parse(_getBaseURLString());
-
-_getPrintClosure() => _print;
-_getScheduleMicrotaskClosure() => _scheduleMicrotask;
-_getGetBaseURLClosure() =>_getBaseURL;
-_getCreateTimerClosure() => _createTimer;