Added support for logging the output of failed flaky tests.

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 cf13237b266ecf3beaab7817db1a53eaca2ed74d..5f7b7fe93271b51d03615928c10abe7e8857b5a9 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -1351,6 +1351,14 @@ class TestUtils {
     return vm;
   }
 
+  static String flakyFileName() {
+    // If a flaky test did fail, infos about it (i.e. test name, stdin, stdout)

[ricow1, 2012/11/08 12:28:50]

s/infos/info

+    // will be written to this file. This is useful for the debugging of

[ricow1, 2012/11/08 12:28:50]

This is useful for debugging flaky tests.

+    // flaky tests.
+    // When running on a built bot, the file can be made visible in the waterfall UI.

[ricow1, 2012/11/08 12:28:50]

Long line

[ricow1, 2012/11/08 12:28:50]

s/built bot/buildbot

+    return ".flaky.log";

[ahe, 2012/11/09 10:35:02]

I suggest that you remove the first dot.

+  }
+
   static void ensureExists(String filename, Map configuration) {
     if (!configuration['list'] && !(new File(filename).existsSync())) {
       throw "Executable '$filename' does not exist";