cps-ir: Add a test for codegeneration.

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';
+
+/// 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;
+
+  CodeEmitterTask get _emitter => _backend.emitter;
+
+  Glue(this._compiler);
+
+  js.Expression constantReference(ConstantValue value) {
+    return _emitter.constantReference(value);
+  }
+
+}