Make dartk-{release,debug} builders work properly again

tools/testing/dart/test_runner.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 2321 matching lines @@
       return;
     }
 
     _process = null;
     locked = false;
     _port = -1;
   }
 
   static Future<String> _firstLine(stream) {
     var completer = new Completer<String>();
-    var first = true;
     stream.transform(UTF8.decoder)
           .transform(new LineSplitter())
           .listen((line) {
-      if (first) {
+      if (!completer.isCompleted) {
         completer.complete(line);
-        first = false;
       }
       // We need to drain a pipe continuously.
+    }, onDone: () {
+      if (!completer.isCompleted) {
+        completer.completeError(
+            "DFE kernel compiler server did not sucessfully start up");
+      }
     });
     return completer.future;
   }
 
   Future _startProcess() async {
     final executable = io.Platform.executable;
     final arguments = ['utils/kernel-service/kernel-service.dart', '--batch'];
 
     try {
       _port = -1;
       _process = await io.Process.start(executable, arguments);
       _process.exitCode.then(_onExit);
-      _process.stderr.drain();
+      _process.stderr.transform(UTF8.decoder).listen(DebugLogger.error);
 
       final readyMsg = await _firstLine(_process.stdout);
       final data = readyMsg.split(' ');
       assert(data[0] == 'READY');
 
       _port = int.parse(data[1]);
     } catch (e) {
       print("Process error:");
       print("  Command: $executable ${arguments.join(' ')}");
       print("  Error: $e");
@@ skipping 935 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }