Make ~/, round, ceil, floor, truncate return ints. Remove toInt.

samples/swarm/swarm_ui_lib/touch/Momentum.dart

 // Copyright (c) 2011, 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 touch;
 
 /**
  * Implementations can be used to simulate the deceleration of an element within
  * a certain region. To use this behavior you need to provide an initial
  * velocity that is meant to represent the gesture that is initiating this
@@ skipping 461 matching lines @@
 
   /**
    * Update the x, y values of the element offset without actually moving the
    * element. This is done because we store decimal values for x, y for
    * precision, but moving is only required when the offset is changed by at
    * least a whole integer.
    */
   void _stepWithoutAnimation() {
     physicsX.step();
     physicsY.step();
-    // TODO(jacobr): double.round() should return an int, see b/5121907
-    _nextX = physicsX._currentOffset.round().toInt();
-    _nextY = physicsY._currentOffset.round().toInt();
+    _nextX = physicsX._currentOffset.round();
+    _nextY = physicsY._currentOffset.round();
   }
 
   /**
    * Calculate the next offset of the element and animate it to that position.
    */
   void _step(num timestamp) {
     _stepTimeout = null;
 
     // Prune moves that are more than 1 frame behind when we have more
     // available moves.
@@ skipping 53 matching lines @@
 
   Coordinate get destination {
     if (!_moves.isEmpty) {
       final lastMove = _moves.last;
       return new Coordinate(lastMove.x, lastMove.y);
     } else {
       return null;
     }
   }
 }