Add a flag controlling how verbose stack traces are.

lib/src/frontend/future_matchers.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.
 
 library test.frontend.future_matchers;
 
 import 'dart:async';
 
 import 'package:matcher/matcher.dart' hide throws, throwsA, expect, fail;
 
@@ skipping 42 matching lines @@
     }, onError: (error, trace) {
       if (error is TestFailure) {
         Invoker.current.handleError(error, trace);
         return;
       }
 
       var id = _id == '' ? '' : '${_id} ';
       var reason = 'Expected future ${id}to complete successfully, '
           'but it failed with ${error}';
       if (trace != null) {
-        var stackTrace = terseChain(trace).toString();
-        stackTrace = '  ${stackTrace.replaceAll('\n', '\n  ')}';
+        var stackTrace = terseChain(trace,
+            verbose: Invoker.current.metadata.verboseTrace);
+        stackTrace = '  ${stackTrace.toString().replaceAll('\n', '\n  ')}';
         reason = '$reason\nStack trace:\n$stackTrace';
       }
       fail(reason);
     });
 
     return true;
   }
 
   Description describe(Description description) {
     if (_matcher == null) {
       description.add('completes successfully');
     } else {
       description.add('completes to a value that ').addDescriptionOf(_matcher);
     }
     return description;
   }
 }