Add renames in output when using the mirror helper library.

tests/compiler/dart2js/mock_compiler.dart

Index: tests/compiler/dart2js/mock_compiler.dart
diff --git a/tests/compiler/dart2js/mock_compiler.dart b/tests/compiler/dart2js/mock_compiler.dart
index 2d72fc5d74639213ff55bcb6f50250ad5f4e5b0a..af844cecd03ee579aa90a16099828b20967f13f5 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -223,6 +223,7 @@ class MockCompiler extends Compiler {
                 bool disableTypeInference: false,
                 bool analyzeAll: false,
                 bool analyzeOnly: false,
+                bool emitJavaScript: true,
                 bool preserveComments: false})
       : warnings = [], errors = [],
         sourceFiles = new Map<String, SourceFile>(),
@@ -233,6 +234,7 @@ class MockCompiler extends Compiler {
               disableTypeInferenceFlag: disableTypeInference,
               analyzeAllFlag: analyzeAll,
               analyzeOnly: analyzeOnly,
+              emitJavaScript: emitJavaScript,
               preserveComments: preserveComments) {
     coreLibrary = createLibrary("core", coreSource);
     // We need to set the assert method to avoid calls with a 'null'