Integrate leg as a component in test.py. Also update presubmit script to run tests with leg.

dart/frog/presubmit.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.
 
 import os
 import subprocess
 import sys
 import time
 
@@ skipping 44 matching lines @@
   vmdone = time.time()
   elapsed = vmdone - start
   print 'Compiling on Dart VM took \033[1m%s\033[0m seconds' % elapsed
   RunCommand('./frogsh', '--out=frogsh', 'frog.dart', 'tests/hello.dart')
   elapsed = time.time() - vmdone
   size = os.path.getsize('./frogsh') / 1024
   print 'Bootstrapping took \033[1m%s\033[0m seconds' % elapsed
   print 'Generated frogsh is \033[1m%d\033[0m kB' % size
 
   RunCommand('../tools/build.py', '--mode=release')
-  test_cmd = ['../tools/test.py', '--component=frog,frogsh',
+  test_cmd = ['../tools/test.py', '--component=frog,frogsh,leg',
               '--report', '--timeout=5', '--progress=color',
               '--mode=release']
   if args[1:]:
     test_cmd.extend(args[1:])
   else:
     test_cmd.extend(['language', 'corelib', 'leg', 'peg'])
   RunCommand(*test_cmd, verbose=True)
+
   leg_test_dir = os.path.join('leg', 'tests')
   for current_dir, directories, filenames in os.walk(leg_test_dir):
     for filename in filenames:
       if filename.endswith('.dart'):
         pattern = 'info: [leg] compilation succeeded'
         node_exit_code = 0
         vm_exit_code = 0
         if filename == 'empty.dart':
           pattern = 'info: [leg] compiler cancelled: Could not find main'
           node_exit_code = 1
           vm_exit_code = 255 # Sigh.
         filename = os.path.join(current_dir, filename)
         frog_bin = os.path.join('.', 'frogsh')
         RunCommand(frog_bin, '--enable_leg', '--verbose', '--throw_on_errors',
                    filename, pattern=pattern, exit_code=node_exit_code)
         frog_bin = os.path.join('.', 'frog.py')
         RunCommand(frog_bin,
                    '--vm_flags=--enable_type_checks --enable_asserts',
                    '--', '--enable_leg', '--verbose', '--throw_on_errors',
                    filename, pattern=pattern, exit_code=vm_exit_code)
 
 if __name__ == '__main__':
   try:
     sys.exit(main(sys.argv))
   except Error as e:
     sys.stderr.write('%s\n' % e)
     sys.exit(1)