MSVS output to /build/ dir.

tools/gyp/common.gypi

 # 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 set of variables needed to build some of the Chrome based subparts of the
 # Dash project (e.g. V8). This is in no way a complete list of variables being
 # defined by Chrome, but just the minimally needed subset.
 
 # Note: this file is similar to all.gypi, but is used when running gyp
 # from subproject directories.  This is deprecated, but still supported.
@@ skipping 11 matching lines @@
       },
     }],
     [ 'OS=="win"', {
       'target_defaults': {
         'msvs_cygwin_dirs': ['<(DEPTH)/../third_party/cygwin'],
       },
     }],
   ],
   'includes': [
     'xcode.gypi',
+    'msvs.gypi',
     'configurations.gypi',
     'source_filter.gypi',
   ],
 }