Add --time option to dart test scripts.

tools/test-runtime.dart

Index: tools/test-runtime.dart
diff --git a/tools/test-runtime.dart b/tools/test-runtime.dart
index 9faa45a65728ad7db385ddb70b92d5ca92bafa59..2b356237fa7d2bf4ba36d82f29e014f56eec269c 100755
--- a/tools/test-runtime.dart
+++ b/tools/test-runtime.dart
@@ -31,6 +31,7 @@ main() {
   var maxProcesses = firstConf['tasks'];
   var progressIndicator = firstConf['progress'];
   var verbose = firstConf['verbose'];
+  var printTiming = firstConf['time'];
 
   var configurationIterator = configurations.iterator();
   bool enqueueConfiguration(ProcessQueue queue) {
@@ -69,5 +70,6 @@ main() {
                                progressIndicator,
                                verbose,
                                startTime,
+                               printTiming,
                                enqueueConfiguration);
 }