Refactoring of ProgressIndicator

tools/test.dart

Index: tools/test.dart
diff --git a/tools/test.dart b/tools/test.dart
index 12cff100c5a64c6acbc267704e242cb41a0f82d5..e72a7e21ff2c51029267973e8e8aec0725148071 100755
--- a/tools/test.dart
+++ b/tools/test.dart
@@ -163,13 +163,23 @@ main() {
     DebugLogger.close();
   }
 
+  var eventListener = [];
+  if (progressIndicator != 'silent') {
+    eventListener.add(new SummaryPrinter());
+    if (printTiming) {
+      eventListener.add(new TimingPrinter(startTime));
+    }
+    eventListener.add(new ProgressIndicator.fromName(progressIndicator,
+                                                     startTime));
+  }
+  eventListener.add(new ExitCodeSetter());
+
   // Start process queue.
   new ProcessQueue(maxProcesses,
                    maxBrowserProcesses,
-                   progressIndicator,
                    startTime,
-                   printTiming,
                    testSuites,
+                   eventListener,
                    allTestsFinished,
                    verbose,
                    listTests);