Print error output from DumpRenderTree updater in test.dart.

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index 9cf136080ccd842dc20d60565817936f73f07379..c2749fda8a571198d66d5d5d795f60651724be55 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -1027,9 +1027,10 @@ class StandardTestSuite implements TestSuite {
   }
 
   List<List<String>> getVmOptions(Map optionsFromFile) {
-    bool needsVmOptions =
-        Contains(configuration['compiler'], const ['none', 'dart2dart', 'dartc']) &&
-        Contains(configuration['runtime'], const ['none', 'vm', 'drt', 'dartium']);
+    bool needsVmOptions = Contains(configuration['compiler'],
+                                   const ['none', 'dart2dart', 'dartc']) &&
+                          Contains(configuration['runtime'],
+                                   const ['none', 'vm', 'drt', 'dartium']);
     if (!needsVmOptions) return [[]];
     return optionsFromFile['vmOptions'];
   }