Lazy implementation of final variables.

lib/compiler/implementation/lib/js_helper.dart

Index: lib/compiler/implementation/lib/js_helper.dart
diff --git a/lib/compiler/implementation/lib/js_helper.dart b/lib/compiler/implementation/lib/js_helper.dart
index afb3acb83be8268496931bacc242db080cb1f5d7..39f277aba8053a1f75637522466aba4c337e1fd9 100644
--- a/lib/compiler/implementation/lib/js_helper.dart
+++ b/lib/compiler/implementation/lib/js_helper.dart
@@ -1194,3 +1194,11 @@ interface JavaScriptIndexingBehavior {
 void throwNoSuchMethod(obj, name, arguments) {
   throw new NoSuchMethodException(obj, name, arguments);
 }
+
+/**
+ * Called by generated code when a static field's initializer references the
+ * field that is currently being initialized.
+ */
+void throwCyclicInit(String staticName) {
+  throw new RuntimeError("Cyclic initialization for static $staticName");
+}