Add timestamps to integration test output.

pkg/analysis_server/test/integration/integration_tests.dart

Index: pkg/analysis_server/test/integration/integration_tests.dart
diff --git a/pkg/analysis_server/test/integration/integration_tests.dart b/pkg/analysis_server/test/integration/integration_tests.dart
index 5e0351a777ac979c21047ca8fc4a4af0d095b8c1..4233704b9a21e53439456f840f1b596c17b13616 100644
--- a/pkg/analysis_server/test/integration/integration_tests.dart
+++ b/pkg/analysis_server/test/integration/integration_tests.dart
@@ -517,7 +517,14 @@ class Server {
    */
   bool _receivedBadDataFromServer = false;
 
-  Server._(this._process);
+  /**
+   * Stopwatch that we use to generate timing information for debug output.
+   */
+  Stopwatch _time = new Stopwatch();
+
+  Server._(this._process) {
+    _time.start();
+  }
 
   /**
    * Get a stream which will receive notifications of the given event type.
@@ -702,6 +709,9 @@ class Server {
    * [debugStdio] has been called.
    */
   void _recordStdio(String line) {
+    double elapsedTime = _time.elapsedTicks.toDouble() /
+        _time.frequency.toDouble();

[scheglov, 2014/07/30 18:46:15]

Do you need toDouble() here?
3 / 2 already gives 1.5

+    line = "$elapsedTime: $line";
     if (_debuggingStdio) {
       print(line);
     }