Change Windows build default to build with VS 2010.

tools/build.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 optparse
 import os
 import shutil
@@ skipping 24 matching lines @@
   result.add_option("--os",
     help='Target OSs (comma-separated).',
     metavar='[all,host,android]',
     default='host')
   result.add_option("-j",
       help='The number of parallel jobs to run.',
       metavar=HOST_CPUS,
       default=str(HOST_CPUS))
   result.add_option("--devenv",
       help='Path containing devenv.com on Windows',
-      default='C:\\Program Files (x86)\\Microsoft Visual Studio 9.0\\Common7\\IDE')
+      default='C:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7'
+      '\\IDE')
+  result.add_option("--executable",
+      help='Name of the devenv.com/msbuild executable on Windows (varies for '
+      'different versions of Visual Studio)', default='devenv.com')
   return result
 
 
 def ProcessOsOption(os):
   if os == 'host':
     return HOST_OS
   return os
 
 
 def ProcessOptions(options, args):
@@ skipping 199 matching lines @@
                   '-parallelizeTargets',
                   '-configuration',
                   build_config,
                   'SYMROOT=%s' % os.path.abspath('xcodebuild')
                   ]
         elif HOST_OS == 'win32':
           project_file = 'dart.sln'
           if os.path.exists('dart-%s.gyp' % CurrentDirectoryBaseName()):
             project_file = 'dart-%s.sln' % CurrentDirectoryBaseName()
           if target == 'all':
-            args = [options.devenv + os.sep + 'devenv.com',
+            args = [options.devenv + os.sep + options.executable,
                     '/build',
                     build_config,
                     project_file
                    ]
           else:
-            args = [options.devenv + os.sep + 'devenv.com',
+            args = [options.devenv + os.sep + options.executable,
                     '/build',
                     build_config,
                     '/project',
                     target,
                     project_file
                    ]
         else:
           make = 'make'
           if HOST_OS == 'freebsd':
             make = 'gmake'
@@ skipping 34 matching lines @@
         process.wait()
         if process.returncode != 0:
           print "BUILD FAILED"
           return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(Main())