Fixed an issue with subprocess.call.

tools/dom/dom.py

 #!/usr/bin/python
 
 # Copyright (c) 2013, 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 script which makes it easy to execute common DOM-related tasks
 
 import os
 import subprocess
@@ skipping 138 matching lines @@
   if argv:
     cmd.append(argv.pop(0))
   else:
     print(
         'Test commands should be followed by tests to run. Defaulting to html')
     cmd.append('html')
   return call(cmd)
 
 def call(args):
   print ' '.join(args)
-  return subprocess.call(args,
-                         stdout=subprocess.STDOUT,
-                         stderr=subprocess.STDERR)
+  pipe = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  output, error = pipe.communicate()
+  if output:
+    print output
+  if error:
+    print error
+  return pipe.returncode
 
 def init_dir():
   ''' Makes sure that we're always rooted in the dart root folder.'''
   dart_dir = os.path.abspath(os.path.join(
       os.path.dirname(os.path.realpath(__file__)),
       os.path.pardir, os.path.pardir))
   os.chdir(dart_dir)
 
 commands = {
   'analyze': [analyze, 'Run the dart analyzer'],
@@ skipping 23 matching lines @@
     success = False
 
   while (argv):
     init_dir()
     command = argv.pop(0)
 
     if not command in commands:
       help();
       success = False
       break
-    success = success and bool(commands[command][0]())
+    returncode = commands[command][0]()
+    success = success and not bool(returncode)
 
   sys.exit(not success)
 
 if __name__ == '__main__':
   main(sys.argv)