Big merge from experimental to bleeding edge.

tests/html/native_gc_test.dart

Index: tests/html/native_gc_test.dart
diff --git a/tests/html/native_gc_test.dart b/tests/html/native_gc_test.dart
index fe27e0bb3c7d48e4f2305b5cdb47725cf8b6d891..87251be4c19fb67c1b42520f40c73e6dac73cd8e 100644
--- a/tests/html/native_gc_test.dart
+++ b/tests/html/native_gc_test.dart
@@ -14,7 +14,7 @@ main() {
       for (int i = 0; i < M; ++i) {
         // This memory should be freed when the listener below is
         // collected.
-        List l = new List(N);
+        List l = new List.fixedLength(N);
 
         // Record the iteration number.
         l[N - 1] = i;
@@ -47,7 +47,7 @@ main() {
 }
 
 void triggerMajorGC() {
-  List list = new List(1000000);
+  List list = new List.fixedLength(1000000);
   Element div = new DivElement();
   div.on.click.add((e) => print(list[0]));
 }