Add flutter_engine runtime to the test script so we can run standard dart tests from the test suite…

tools/testing/dart/status_reporter.dart

 // Copyright (c) 2015, 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:io';
 import 'dart:convert';
 
 List<Map> LINUX_COMBINATIONS = [
   {
     'runtimes': ['none'],
@@ skipping 12 matching lines @@
     'modes': ['release'],
     'archs': ['ia32'],
     'compiler': 'dart2js'
   },
   {
     'runtimes': ['dartium'],
     'modes': ['release', 'debug'],
     'archs': ['ia32'],
     'compiler': 'none'
   },
+  {
+    'runtimes': ['flutter_engine'],
+    'modes': ['debug', 'release'],
+    'archs': ['x64'],
+    'compiler': 'none'
+  },
 ];
 
 List<Map> MACOS_COMBINATIONS = [
   {
     'runtimes': ['vm'],
     'modes': ['debug', 'release'],
     'archs': ['ia32', 'x64'],
     'compiler': 'none'
   },
   {
@@ skipping 169 matching lines @@
             var pct = 100 * (value / total);
             values.add('${pct.toStringAsFixed(3)}%');
           }
 
           print(values.join(','));
         }
       }
     }
   }
 }