sdk files reorganization to make dart2js a proper package

sdk/lib/_internal/compiler/js_lib/async_patch.dart

-// 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.
-
-// Patch file for the dart:async library.
-
-import 'dart:_js_helper' show
-    patch,
-    Primitives,
-    convertDartClosureToJS,
-    requiresPreamble;
-import 'dart:_isolate_helper' show
-    IsolateNatives,
-    TimerImpl,
-    leaveJsAsync,
-    enterJsAsync,
-    isWorker;
-
-import 'dart:_foreign_helper' show JS;
-
-@patch
-class _AsyncRun {
-  @patch
-  static void _scheduleImmediate(void callback()) {
-    scheduleImmediateClosure(callback);
-  }
-
-  // Lazily initialized.
-  static final Function scheduleImmediateClosure =
-      _initializeScheduleImmediate();
-
-  static Function _initializeScheduleImmediate() {
-    requiresPreamble();
-    if (JS('', 'self.scheduleImmediate') != null) {
-      return _scheduleImmediateJsOverride;
-    }
-    if (JS('', 'self.MutationObserver') != null &&
-        JS('', 'self.document') != null) {
-      // Use mutationObservers.
-      var div = JS('', 'self.document.createElement("div")');
-      var span = JS('', 'self.document.createElement("span")');
-      var storedCallback;
-
-      internalCallback(_) {
-        leaveJsAsync();
-        var f = storedCallback;
-        storedCallback = null;
-        f();
-      };
-
-      var observer = JS('', 'new self.MutationObserver(#)',
-          convertDartClosureToJS(internalCallback, 1));
-      JS('', '#.observe(#, { childList: true })',
-          observer, div);
-
-      return (void callback()) {
-        assert(storedCallback == null);
-        enterJsAsync();
-        storedCallback = callback;
-        // Because of a broken shadow-dom polyfill we have to change the
-        // children instead a cheap property.
-        // See https://github.com/Polymer/ShadowDOM/issues/468
-        JS('', '#.firstChild ? #.removeChild(#): #.appendChild(#)',
-            div, div, span, div, span);
-      };
-    } else if (JS('', 'self.setImmediate') != null) {
-      return _scheduleImmediateWithSetImmediate;
-    }
-    // TODO(20055): We should use DOM promises when available.
-    return _scheduleImmediateWithTimer;
-  }
-
-  static void _scheduleImmediateJsOverride(void callback()) {
-    internalCallback() {
-      leaveJsAsync();
-      callback();
-    };
-    enterJsAsync();
-    JS('void', 'self.scheduleImmediate(#)',
-       convertDartClosureToJS(internalCallback, 0));
-  }
-
-  static void _scheduleImmediateWithSetImmediate(void callback()) {
-    internalCallback() {
-      leaveJsAsync();
-      callback();
-    };
-    enterJsAsync();
-    JS('void', 'self.setImmediate(#)',
-       convertDartClosureToJS(internalCallback, 0));
-  }
-
-  static void _scheduleImmediateWithTimer(void callback()) {
-    Timer._createTimer(Duration.ZERO, callback);
-  }
-}
-
-@patch
-class DeferredLibrary {
-  @patch
-  Future<Null> load() {
-    throw 'DeferredLibrary not supported. '
-          'please use the `import "lib.dart" deferred as lib` syntax.';
-  }
-}
-
-@patch
-class Timer {
-  @patch
-  static Timer _createTimer(Duration duration, void callback()) {
-    int milliseconds = duration.inMilliseconds;
-    if (milliseconds < 0) milliseconds = 0;
-    return new TimerImpl(milliseconds, callback);
-  }
-
-  @patch
-  static Timer _createPeriodicTimer(Duration duration,
-                             void callback(Timer timer)) {
-    int milliseconds = duration.inMilliseconds;
-    if (milliseconds < 0) milliseconds = 0;
-    return new TimerImpl.periodic(milliseconds, callback);
-  }
-}