Add Null class to dart:core.

sdk/lib/_internal/lib/foreign_helper.dart

Index: sdk/lib/_internal/lib/foreign_helper.dart
diff --git a/sdk/lib/_internal/lib/foreign_helper.dart b/sdk/lib/_internal/lib/foreign_helper.dart
index 73e3c09498b0954bec7eb4547ef9aa08b6969c01..1626ee4ef0f4e9634e3190833f28bec5dc760a7c 100644
--- a/sdk/lib/_internal/lib/foreign_helper.dart
+++ b/sdk/lib/_internal/lib/foreign_helper.dart
@@ -177,6 +177,9 @@ String JS_OPERATOR_AS_PREFIX() {}
 /// Returns the name of the class `Object` in the generated code.
 String JS_OBJECT_CLASS_NAME() {}
 
+/// Returns the name of the class `Null` in the generated code.
+String JS_NULL_CLASS_NAME() {}

[ahe, 2013/08/15 11:16:46]

I would have preferred if you had extended JS_GET_NAME instead.

[Lasse Reichstein Nielsen, 2013/08/15 13:06:10]

Why be different from, e.g., Object and Function?

+
 /// Returns the name of the class `Function` in the generated code.
 String JS_FUNCTION_CLASS_NAME() {}