Enable co19 test suite on dart test scripts.

tools/test.dart

Index: tools/test.dart
diff --git a/tools/test.dart b/tools/test.dart
index 0954647bb54282ad377c3c8ae0c15f5f66cc71de..d98fa2c23b3461eaea994672c0a7c8f3ff1f20c5 100755
--- a/tools/test.dart
+++ b/tools/test.dart
@@ -10,6 +10,7 @@
 
 #import("../tests/standalone/test_config.dart");
 #import("../tests/corelib/test_config.dart");
+#import("../tests/co19/test_config.dart");
 
 // TODO(ager): This activity tracking is temporary until stdout is
 // closed implicitly when nothing more can happen.
@@ -41,5 +42,7 @@ main() {
     new StandaloneTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
     activityStarted();
     new CorelibTestSuite(conf).forEachTest(queue.runTest, activityCompleted);
+    activityStarted();
+    new Co19TestSuite(conf).forEachTest(queue.runTest, activityCompleted);
   }
 }