Add .test-outcome.log support to test.dart

dart/tools/test.dart

Index: dart/tools/test.dart
diff --git a/dart/tools/test.dart b/dart/tools/test.dart
index c96084db1aeca522361fa7e67ba5c1f1ef7d1561..b7afb77fb9fe5ae5592350d774100bfc733ede2c 100755
--- a/dart/tools/test.dart
+++ b/dart/tools/test.dart
@@ -99,9 +99,12 @@ void testConfigurations(List<Map> configurations) {
   }
 
   if (!firstConf['append_logs'])  {
-    var file = new File(TestUtils.flakyFileName());
-    if (file.existsSync()) {
-      file.deleteSync();
+    var files = [new File(TestUtils.flakyFileName()),
+                 new File(TestUtils.testOutcomeFileName())];
+    for (var file in files) {
+      if (file.existsSync()) {
+        file.deleteSync();
+      }
     }
   }
 
@@ -240,6 +243,9 @@ void testConfigurations(List<Map> configurations) {
     eventListener.add(new SkippedCompilationsPrinter());
     eventListener.add(new LeftOverTempDirPrinter());
   }
+  if (firstConf['write_test_outcome_log']) {
+    eventListener.add(new TestOutcomeLogWriter());
+  }
   eventListener.add(new ExitCodeSetter());
 
   void startProcessQueue() {