Big merge from experimental to bleeding edge.

samples/clock/clock.dart

Index: samples/clock/clock.dart
diff --git a/samples/clock/clock.dart b/samples/clock/clock.dart
index 737f68bf5e74e422dfd8f39a6524f47049d3ba41..9a90c2e0b731655b2c37340cd2815f3a6cca3c3b 100644
--- a/samples/clock/clock.dart
+++ b/samples/clock/clock.dart
@@ -34,9 +34,9 @@ class CountDownClock {
   static const double BALL_WIDTH = 19.0;
   static const double BALL_HEIGHT = 19.0;
 
-  List<ClockNumber> hours = new List<ClockNumber>(2);
-  List<ClockNumber> minutes = new List<ClockNumber>(2);
-  List<ClockNumber> seconds = new List<ClockNumber>(2);
+  List<ClockNumber> hours = new List<ClockNumber>.fixedLength(2);
+  List<ClockNumber> minutes = new List<ClockNumber>.fixedLength(2);
+  List<ClockNumber> seconds = new List<ClockNumber>.fixedLength(2);
   int displayedHour = 0;
   int displayedMinute = 0;
   int displayedSecond = 0;