Removing setImmediate and hiding WindowTimers interface (take 2)

samples/clock/web/numbers.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.
 
 part of clock;
 
 class ClockNumber {
   static const int WIDTH = 4;
   static const int HEIGHT = 7;
 
@@ skipping 25 matching lines @@
     }
   }
 
   void setPixels(List<List<int>> px) {
     for (int y = 0; y < HEIGHT; ++y) {
       for (int x = 0; x < WIDTH; ++x) {
         ImageElement img = imgs[y][x];
 
         if (pixels != null) {
           if ((pixels[y][x] != 0) && (px[y][x] == 0)) {
-            window.setImmediate(() {
+            scheduleMicrotask(() {
               var r = img.getBoundingClientRect();
               double absx = r.left;
               double absy = r.top;
 
               app.balls.add(absx, absy, ballColor);
             });
           }
         }
 
         img.src = px[y][x] != 0 ? Balls.PNGS[ballColor] : Balls.PNGS[6];
@@ skipping 102 matching lines @@
        const[ 1, 1, 1, 1 ],
        const[ 1, 0, 0, 1 ],
        const[ 1, 0, 0, 1 ],
        const[ 1, 1, 1, 1 ],
        const[ 0, 0, 0, 1 ],
        const[ 0, 0, 0, 1 ],
        const[ 1, 1, 1, 1 ]
     ]
   ];
 }