Get rid of 'close' on process. It is very easy to use incorrectly and cut off data from your stream…

utils/testrunner/layout_test_controller.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.
 
 // The following set of variables should be set by the caller that
 // #sources this file.
 /** Whether to include elapsed time. */
 
 part of test_controller;
 
@@ skipping 111 matching lines @@
     printSummary(testfile, passCount, failCount, errorCount);
   }
   notifyDone(failCount > 0 ? -1 : 0);
 }
 
 runTextLayoutTest(testNum) {
   var url = '$baseUrl?test=$testNum';
   var stdout = new List();
   start = new Date.now();
   Process.start(drt, [url]).then((process) {
+    // Drain stderr to not leak resources.
+    process.stderr.onData = process.stderr.read;
     StringInputStream stdoutStringStream =
         new StringInputStream(process.stdout);
     stdoutStringStream.onLine = () {
       if (stdoutStringStream.closed) return;
       var line = stdoutStringStream.readLine();
       while (null != line) {
         stdout.add(line);
         line = stdoutStringStream.readLine();
       }
     };
@@ skipping 64 matching lines @@
       }
     };
   });
 }
 
 runPixelLayoutTest(int testNum) {
   var url = '$baseUrl?test=$testNum';
   var stdout = new List();
   start = new Date.now();
   Process.start(drt, ["$url'-p"]).then((process) {
+    // Drain stderr to not leak resources.
+    process.stderr.onData = process.stderr.read;
     ListInputStream stdoutStream = process.stdout;
     stdoutStream.onData = () {
       if (!stdoutStream.closed) {
         var data = stdoutStream.read();
         stdout.addAll(data);
       }
     };
     stdoutStream.onError = (e) {
       print(e);
     };
@@ skipping 83 matching lines @@
 
 void runPixelLayoutTests() {
   init();
   runPixelLayoutTest(0);
 }
 
 void runTextLayoutTests() {
   init();
   runTextLayoutTest(0);
 }