Explicitly use node.js in the cases where it is needed.

dart/utils/tests/dartdoc/test_config.dart

Index: dart/utils/tests/dartdoc/test_config.dart
diff --git a/dart/utils/tests/dartdoc/test_config.dart b/dart/utils/tests/dartdoc/test_config.dart
index cfc35cc156057d971bbf76bafabd554a415c012c..26a33908abe013348fb3fa0ca86a6d04cc66f1ff 100644
--- a/dart/utils/tests/dartdoc/test_config.dart
+++ b/dart/utils/tests/dartdoc/test_config.dart
@@ -13,5 +13,14 @@ class DartdocTestSuite extends StandardTestSuite {
               "utils/tests/dartdoc/src",
               ["utils/tests/dartdoc/dartdoc.status"]);
 
+  List<String> additionalOptions(String filename) {
+    if (configuration['component'].startsWith('frog')) {
+      return ['--js_cmd=node --crankshaft'];
+    } else {
+      return [];
+    }
+  }
+
+
   bool isTestFile(String filename) => filename.endsWith("_tests.dart");
 }