tools/testing: move code into individual libraries

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.
  */
 library test_runner;
 
 import "dart:async";
 import "dart:collection" show Queue;
 import "dart:convert" show LineSplitter, UTF8, JSON;
 // We need to use the 'io' prefix here, otherwise io.exitCode will shadow
 // CommandOutput.exitCode in subclasses of CommandOutput.
 import "dart:io" as io;
 import "dart:math" as math;
 import 'dependency_graph.dart' as dgraph;
 import "browser_controller.dart";
+import "path.dart";
 import "status_file_parser.dart";
 import "test_progress.dart";
 import "test_suite.dart";
 import "utils.dart";
 import 'record_and_replay.dart';
 
 const int CRASHING_BROWSER_EXITCODE = -10;
 const int SLOW_TIMEOUT_MULTIPLIER = 4;
 
 const MESSAGE_CANNOT_OPEN_DISPLAY = 'Gtk-WARNING **: cannot open display';
@@ skipping 2914 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }