Move the status file parser into its own package.

tools/testing/dart/summary_report.dart

 // Copyright (c) 2014, 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.
 
 library summary_report;
 
-import "expectation.dart";
+import "package:status_file/expectation.dart";
+
 import "test_runner.dart";
 
 final summaryReport = new SummaryReport();
 
 class SummaryReport {
   int _total = 0;
   int _skipped = 0;
   int _skippedByDesign = 0;
   int _noCrash = 0;
   int _flakyCrash = 0;
@@ skipping 106 matching lines @@
  * $_timeout tests are allowed to timeout
  * $_compileErrorSkip tests are skipped on browsers due to compile-time error
  * $bogus could not be categorized or are in multiple categories
 """;
 
   void printReport() {
     if (_total == 0) return;
     print(report);
   }
 }