Generate tear-off closures dynamically.

dart/sdk/lib/_internal/compiler/implementation/js_emitter/declarations.dart

 // Copyright (c) 2013, 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 dart2js.js_emitter;
 
 /// Enables debugging of fast/slow objects using V8-specific primitives.
 const DEBUG_FAST_OBJECTS = false;
 
 /**
- * A convenient type alias for some functions that emit keyed values.
+ * Call-back for adding stub [function] for [selector].
  */
-typedef void DefineStubFunction(String invocationName, jsAst.Expression value);
+typedef void AddStubFunction(Selector selector, jsAst.Fun function);
+
+/**
+ * Call-back for adding property with [name] and [value].
+ */
+typedef void AddPropertyFunction(String name, jsAst.Expression value);
 
 /**
  * [member] is a field (instance, static, or top level).
  *
  * [name] is the field name that the [Namer] has picked for this field's
  * storage, that is, the JavaScript property name.
  *
  * [accessorName] is the name of the accessor. For instance fields this is
  * mostly the same as [name] except when [member] is shadowing a field in its
  * superclass.  For other fields, they are rarely the same.
@@ skipping 51 matching lines @@
 // characters.
 const FIELD_CODE_CHARACTERS = r"<=>?@{|}~%&'()*";
 const NO_FIELD_CODE = 0;
 const FIRST_FIELD_CODE = 1;
 const RANGE1_FIRST = 0x3c;   //  <=>?@    encodes 1..5
 const RANGE1_LAST = 0x40;
 const RANGE2_FIRST = 0x7b;   //  {|}~     encodes 6..9
 const RANGE2_LAST = 0x7e;
 const RANGE3_FIRST = 0x25;   //  %&'()*+  encodes 10..16
 const RANGE3_LAST = 0x2b;