Support for pixel layout tests.

utils/testrunner/run_process_task.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.
 
 /** A pipeline task to run a process and capture the output. */
 class RunProcessTask extends PipelineTask {
   String _commandTemplate;
   List _argumentTemplates;
   int _timeout;
 
   void init(String commandTemplate, List argumentTemplates, int timeout) {
     this._commandTemplate = commandTemplate;
     this._argumentTemplates = argumentTemplates;
     this._timeout = timeout;
   }
 
   RunProcessTask();
 
   void execute(Path testfile, List stdout, List stderr, bool logging,
               Function exitHandler) {
     var cmd = expandMacros(_commandTemplate, testfile);
     List args = new List();
     for (var i = 0; i < _argumentTemplates.length; i++) {
       args.add(expandMacros(_argumentTemplates[i], testfile));
     }
-
     if (logging) {
       stdout.add('Running $cmd ${Strings.join(args, " ")}');
     }
     var timer = null;
     var process = Process.start(cmd, args);
     process.onStart = () {
       timer = new Timer(1000 * _timeout, (t) {
         timer = null;
         process.kill();
       });
@@ skipping 29 matching lines @@
           _outStream.writeString(line.substring(3));
           _outStream.writeString('\n');
         } else {
           destination.add(line);
         }
         line = source.readLine();
       }
     };
   }
 }