Perform better activity tracking in test scripts.

tools/test.dart

Index: tools/test.dart
diff --git a/tools/test.dart b/tools/test.dart
index 89014cf25f2bc7bc114bd2ad80af8dc3c53c2b7f..8dd7354f95b80bd2b160d62c8132b947f4fcd30c 100755
--- a/tools/test.dart
+++ b/tools/test.dart
@@ -17,55 +17,26 @@
 #import("../runtime/tests/vm/test_config.dart");
 #import("../samples/tests/samples/test_config.dart");
 
-// TODO(ager): This activity tracking is temporary until stdout is
-// closed implicitly when nothing more can happen.
-int pendingActivities = 0;
-
-void activityStarted() {
-  ++pendingActivities;
-}
-
-void activityCompleted() {
-  --pendingActivities;
-}
-
-void exitIfLastActivity() {
-  if (pendingActivities == 1) {
-    stdout.write('\n'.charCodes());
-    stdout.close();
-  }
-}
-
 main() {
   var startTime = new Date.now();
   var optionsParser = new TestOptionsParser();
   var configurations = optionsParser.parse(new Options().arguments);
   if (configurations == null) return;
-  activityStarted();
   // Extract global options from first configuration.
   var firstConf = configurations[0];
   var queue = new ProcessQueue(firstConf['tasks'],
                                firstConf['progress'],
-                               startTime,
-                               exitIfLastActivity);
+                               startTime);
   for (var conf in configurations) {
-    activityStarted();
-    new SamplesTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
-    activityStarted();
-    new StandaloneTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
-    activityStarted();
-    new CorelibTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
-    activityStarted();
-    new Co19TestSuite(conf).forEachTest(queue.runTest, activityCompleted);
-    activityStarted();
-    new LanguageTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
-    activityStarted();
-    new IsolateTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
-    activityStarted();
-    new StubGeneratorTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
+    queue.addTestSuite(new SamplesTestSuite(conf));
+    queue.addTestSuite(new StandaloneTestSuite(conf));
+    queue.addTestSuite(new CorelibTestSuite(conf));
+    queue.addTestSuite(new Co19TestSuite(conf));
+    queue.addTestSuite(new LanguageTestSuite(conf));
+    queue.addTestSuite(new IsolateTestSuite(conf));
+    queue.addTestSuite(new StubGeneratorTestSuite(conf));
     if (conf["component"] == "vm") {
-      activityStarted();
-      new VMTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
+      queue.addTestSuite(new VMTestSuite(conf));
     }
   }
 }