Reapply "Create an app snapshot of the Dart front end."

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 2371 matching lines @@
         completer.complete(line);
         first = false;
       }
       // We need to drain a pipe continuously.
     });
     return completer.future;
   }
 
   Future _startProcess() async {
     final executable = io.Platform.executable;
-    final arguments = ['runtime/tools/kernel-service.dart', '--batch'];
+    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();
 
       final readyMsg = await _firstLine(_process.stdout);
       final data = readyMsg.split(' ');
       assert(data[0] == 'READY');
@@ skipping 938 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }