Add timing information for the individual steps of a failing test.

tools/testing/dart/test_progress.dart

Index: tools/testing/dart/test_progress.dart
===================================================================
--- tools/testing/dart/test_progress.dart	(revision 24128)
+++ tools/testing/dart/test_progress.dart	(working copy)
@@ -128,8 +128,14 @@
   }
   for (var i = 0; i < test.commands.length; i++) {
     var command = test.commands[i];
+    var commandOutput = test.commandOutputs[command];
     output.add('');
     output.add('Command[$i]: $command');
+    if (commandOutput != null) {

[kustermann, 2013/06/20 08:05:28]

I think we should not print it out together with the reproduction commands but
rather with the output.

[ricow1, 2013/06/20 08:23:11]

It will be messed up with tons of output in certain cases, here you have an easy
overview of how long each step took

+      output.add('Took ${commandOutput.time}');
+    } else {
+      output.add('Did not run');
+    }
   }
   return output;
 }