Use filtered stacks in pub, barback, and watcher tests.

pkg/watcher/test/utils.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 watcher.test.utils;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
@@ skipping 20 matching lines @@
 /// times. This means using the real file system requires us to put delays in
 /// the tests to ensure we wait long enough between operations for the mod time
 /// to be different.
 ///
 /// Instead, we'll just mock that out. Each time a file is written, we manually
 /// increment the mod time for that file instantly.
 Map<String, int> _mockFileModificationTimes;
 
 void initConfig() {
   useCompactVMConfiguration();
+  filterStacks = true;
 }
 
 /// Creates the sandbox directory the other functions in this library use and
 /// ensures it's deleted when the test ends.
 ///
 /// This should usually be called by [setUp].
 void createSandbox() {
   var dir = new Directory("").createTempSync();
   _sandboxDir = dir.path;
 
@@ skipping 168 matching lines @@
 
   Description describe(Description description) {
     description.add("$type $path");
   }
 
   bool matches(item, Map matchState) =>
       item is WatchEvent &&
       item.type == type &&
       p.normalize(item.path) == p.normalize(path);
 }