Update dummy compiler with new interceptor-related methods

tests/utils/dummy_compiler_test.dart

Index: tests/utils/dummy_compiler_test.dart
diff --git a/tests/utils/dummy_compiler_test.dart b/tests/utils/dummy_compiler_test.dart
index c4d660314bf84f1d66866fb046021be20ce8cd81..2162601f7030c5f161247738fe9590c7a1dbaf77 100644
--- a/tests/utils/dummy_compiler_test.dart
+++ b/tests/utils/dummy_compiler_test.dart
@@ -61,7 +61,9 @@ Future<String> provider(Uri uri) {
                   class JSNumber {}
                   class JSNull {}
                   class JSBool {}
-                  var getInterceptor;""";
+                  getInterceptor(o){}
+                  getDispatchProperty(o) {}
+                  setDispatchProperty(o, v) {}""";
     } else if (uri.path.endsWith('js_helper.dart')) {
       source = 'library jshelper; class JSInvocationMirror {} '
                'class ConstantMap {} class TypeImpl {}';