First version of typr propagation in the new IR.

pkg/compiler/lib/src/js_backend/codegen/glue.dart

 // Copyright (c) 2014, 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.
 
 library code_generator_dependencies;
 
 import '../js_backend.dart';
 import '../../dart2jslib.dart';
 import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
 import '../../constants/values.dart';
 import '../../elements/elements.dart';
 import '../../constants/expressions.dart';
+import 'task.dart' show CpsTypeEnvironment;
 
 /// Encapsulates the dependencies of the function-compiler to the compiler,
 /// backend and emitter.
 // TODO(sigurdm): Should be refactored when we have a better feeling for the
 // interface.
 class Glue {
   final Compiler _compiler;
 
   JavaScriptBackend get _backend => _compiler.backend;
 
@@ skipping 36 matching lines @@
 
   String invocationName(Selector selector) {
     return _namer.invocationName(selector);
   }
 
   bool isIntercepted(Selector selector) {
     return _backend.isInterceptedSelector(selector);
   }
 
 }