Add optional message to assert in Dart2js - continued

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 b52951c119409a518164fa2bc0ec4ded923cf3e0..06265f4982ce8066c1fdc6febb37a6a360d8355c 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -74,6 +74,7 @@ class MockCompiler extends Compiler {
   MockCompiler.internal(
       {Map<String, String> coreSource,
        bool enableTypeAssertions: false,
+       bool enableUserAssertions: false,
        bool enableMinification: false,
        bool enableConcreteTypeInference: false,
        int maxConcreteTypeSize: 5,
@@ -95,6 +96,8 @@ class MockCompiler extends Compiler {
       : sourceFiles = new Map<String, SourceFile>(),
         testedPatchVersion = patchVersion,
         super(enableTypeAssertions: enableTypeAssertions,
+              enableUserAssertions: enableUserAssertions,
+              enableAssertMessage: true,
               enableMinification: enableMinification,
               enableConcreteTypeInference: enableConcreteTypeInference,
               maxConcreteTypeSize: maxConcreteTypeSize,
@@ -447,6 +450,7 @@ MockCompiler compilerFor(String code, Uri uri,
                           bool minify: false,
                           bool trustTypeAnnotations: false,
                           bool enableTypeAssertions: false,
+                          bool enableUserAssertions: false,
                           int expectedErrors,
                           int expectedWarnings,
                           api.CompilerOutputProvider outputProvider}) {
@@ -458,6 +462,7 @@ MockCompiler compilerFor(String code, Uri uri,
       enableMinification: minify,
       trustTypeAnnotations: trustTypeAnnotations,
       enableTypeAssertions: enableTypeAssertions,
+      enableUserAssertions: enableUserAssertions,
       expectedErrors: expectedErrors,
       expectedWarnings: expectedWarnings,
       outputProvider: outputProvider);