Added json result of test output to output debug directory.

tools/testing/dart/test_configurations.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.
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:math' as math;
 
 import 'android.dart';
 import 'browser_controller.dart';
@@ skipping 215 matching lines @@
     if (printTiming) {
       eventListener.add(new TimingPrinter(startTime));
     }
     eventListener.add(new SkippedCompilationsPrinter());
   }
 
   if (firstConf.writeTestOutcomeLog) {
     eventListener.add(new TestOutcomeLogWriter());
   }
 
+  if (firstConf.writeResultLog) {
+    eventListener.add(new ResultLogWriter());
+  }
+
   if (firstConf.copyCoreDumps) {
     eventListener.add(new UnexpectedCrashLogger());
   }
 
   // The only progress indicator when listing tests should be the
   // the summary printer.
   if (listTests) {
     eventListener.add(new SummaryPrinter(jsonOnly: reportInJson));
   } else {
     eventListener.add(new ExitCodeSetter());
@@ skipping 14 matching lines @@
   // Start all the HTTP servers required before starting the process queue.
   if (!serverFutures.isEmpty) {
     await Future.wait(serverFutures);
   }
 
   // [firstConf] is needed here, since the ProcessQueue needs to know the
   // settings of 'noBatch' and 'local_ip'
   new ProcessQueue(firstConf, maxProcesses, maxBrowserProcesses, startTime,
       testSuites, eventListener, allTestsFinished, verbose, adbDevicePool);
 }