Add test annotations to package:expect

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, 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.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 158 matching lines @@
     ..visitVariableElement(null)
     ..visitWarnOnUseElement(null);
 }
 
 useJs(js.Node node) {
   node.asVariableUse();
 }
 
 useJsBackend(js_backend.JavaScriptBackend backend) {
   backend.assembleCode(null);
+  backend.annotations.noInlining(null);
+  backend.annotations.trustTypeAnnotations(null);
+  backend.annotations.assumeDynamic(null);
 }
 
 useConcreteTypesInferrer(concrete_types_inferrer.ConcreteTypesInferrer c) {
   c.debug();
 }
 
 useColor() {
   colors.white(null);
   colors.blue(null);
   colors.yellow(null);
@@ skipping 91 matching lines @@
 }
 
 useScript(dart2jslib.Script script) {
   script.copyWithFile(null);
 }
 
 useProgramBuilder(program_builder.ProgramBuilder builder) {
   builder.buildMethodHackForIncrementalCompilation(null);
   builder.buildFieldsHackForIncrementalCompilation(null);
 }