Adding in-browser correctness testing via selenium.

tools/test.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2011, 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.
 #
 
 """Test driver for the Dart project used by continuous build and developers."""
 
 
@@ skipping 460 matching lines @@
     if cleanup: self.Cleanup()
     return test_output
 
   def BeforeRun(self):
     pass
 
   def AfterRun(self):
     pass
 
   def Run(self):
-    self.BeforeRun()
+    errorCode = self.BeforeRun()
+    if errorCode:
+      return errorCode
     cmd = self.GetCommand()
     try:
       result = self.RunCommand(cmd)
     finally:
       self.AfterRun()
     return result
 
   def Cleanup(self):
     return
 
@@ skipping 720 matching lines @@
       default='true',
       type='choice')
   result.add_option(
       '--optimize',
       help='Invoke dart compiler with --optimize flag',
       default=False,
       action='store_true')
   result.add_option(
       '-c', '--component',
       help='The component to test against '
-           '(most, vm, dartc, frog, frogsh, leg, chromium, dartium)',
+           '(most, vm, dartc, frog, frogsh, leg, chromium, dartium, '
+           'webdriver)',
       metavar='[most,vm,dartc,chromium,dartium]',
       default='vm')
   return result
 
 
 def ProcessOptions(options):
   """Process command line options."""
   if options.arch == 'all':
     options.arch = 'ia32,x64,simarm'
   if options.mode == 'all':
@@ skipping 19 matching lines @@
   for mode in options.mode:
     if not mode in ['debug', 'release']:
       print 'Unknown mode %s' % mode
       return False
   for arch in options.arch:
     if not arch in ['ia32', 'x64', 'simarm', 'arm']:
       print 'Unknown arch %s' % arch
       return False
   for component in options.component:
     if not component in ['vm', 'dartc', 'frog', 'frogsh', 'leg',
-                         'chromium', 'dartium']:
+                         'chromium', 'dartium', 'webdriver']:
       print 'Unknown component %s' % component
       return False
   options.flags = []
   options.flags.append('--ignore-unrecognized-flags')
   if options.checked:
     options.flags.append('--enable_asserts')
     options.flags.append('--enable_type_checks')
   if options.optimize:
     options.flags.append('--optimize')
   for flag in options.flag:
@@ skipping 249 matching lines @@
     for entry in timed_tests[:20]:
       t = FormatTime(entry.duration)
       print '%4i (%s) %s' % (index, t, entry.GetLabel())
       index += 1
 
   return result
 
 
 if __name__ == '__main__':
   sys.exit(Main())