Get `gn gen` to succeed on Windows

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 29 matching lines @@
   # and whatever else without interference from each other.
   'pdfium_revision': '767aebbef641a89498deebc29369a078207b4dcc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
   'boringssl_revision': '751e889b1d791d2b91c1437248454fa1d4e101a5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lss
   # and whatever else without interference from each other.
   'lss_revision': '952107fa7cea0daaabead28c0e92d579bee517eb',
+  # Three lines of non-changing comments so that
+  # the commit queue can handle CLs rolling nss
+  # and whatever else without interference from each other.
+  'nss_revision': '87b96db4268293187d7cf741907a6d5d1d8080e0',
 }
 
 # Only these hosts are allowed for dependencies in this DEPS file.
 # If you need to add a new host, contact chrome infrastracture team.
 allowed_hosts = [
   'chromium.googlesource.com',
   'boringssl.googlesource.com',
   'pdfium.googlesource.com',
 ]
 
@@ skipping 90 matching lines @@
 
     'src/third_party/jsr-305/src':
         Var('chromium_git') + '/external/jsr-305.git' + '@' + '642c508235471f7220af6d5df2d3210e3bfc0919',
 
     'src/third_party/android_tools':
      Var('chromium_git') + '/android_tools.git' + '@' + 'ea50cccc11657404ce22cf928062ed1a3927eb39',
 
     'src/third_party/freetype':
        Var('chromium_git') + '/chromium/src/third_party/freetype.git' + '@' + 'a2b9955b49034a51dfbc8bf9f4e9d312149cecac',
   },
+  'win': {
+    'src/third_party/nss':
+     Var('chromium_git') + '/chromium/deps/nss.git' + '@' + Var('nss_revision'),
+    'src/third_party/bison':
+     Var('chromium_git') + '/chromium/deps/bison.git' + '@' + '083c9a45e4affdd5464ee2b224c2df649c6e26c3',
+    'src/third_party/gperf':
+     Var('chromium_git') + '/chromium/deps/gperf.git' + '@' + 'd892d79f64f9449770443fb06da49b5a1e5d33c1',
+  }
 }
 
 
 include_rules = [
   # Everybody can use some things.
   '+base',
   '+build',
 
   '+testing',
   '+third_party/icu/source/common/unicode',
@@ skipping 63 matching lines @@
     'name': 'gn_linux64',
     'pattern': '.',
     'action': [ 'download_from_google_storage',
                 '--no_resume',
                 '--platform=linux*',
                 '--no_auth',
                 '--bucket', 'chromium-gn',
                 '-s', 'src/buildtools/linux64/gn.sha1',
     ],
   },
+  {
+    'name': 'gn_win',
+    'pattern': '.',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=win*',
+                '--no_auth',
+                '--bucket', 'chromium-gn',
+                '-s', 'src/buildtools/win/gn.exe.sha1',
+    ],
+  },
   # Pull clang-format binaries using checked-in hashes.
   {
     'name': 'clang_format_linux',
     'pattern': '.',
     'action': [ 'download_from_google_storage',
                 '--no_resume',
                 '--platform=linux*',
                 '--no_auth',
                 '--bucket', 'chromium-clang-format',
                 '-s', 'src/buildtools/linux64/clang-format.sha1',
@@ skipping 27 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]