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diff --git a/deps/v8/build/toolchain/win/tool_wrapper.py b/deps/v8/build/toolchain/win/tool_wrapper.py
new file mode 100644
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+++ b/deps/v8/build/toolchain/win/tool_wrapper.py
@@ -0,0 +1,245 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Utility functions for Windows builds.
+
+This file is copied to the build directory as part of toolchain setup and
+is used to set up calls to tools used by the build that need wrappers.
+"""
+
+from __future__ import print_function
+
+import os
+import re
+import shutil
+import subprocess
+import stat
+import string
+import sys
+
+# tool_wrapper.py doesn't get invoked through python.bat so the Python bin
+# directory doesn't get added to the path. The Python module search logic
+# handles this fine and finds win32file.pyd. However the Windows module
+# search logic then looks for pywintypes27.dll and other DLLs in the path and
+# if it finds versions with a different bitness first then win32file.pyd will
+# fail to load with a cryptic error:
+#     ImportError: DLL load failed: %1 is not a valid Win32 application.
+if sys.platform == 'win32':
+  os.environ['PATH'] = os.path.dirname(sys.executable) + \
+                       os.pathsep + os.environ['PATH']
+  import win32file    # pylint: disable=import-error
+
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+
+# A regex matching an argument corresponding to the output filename passed to
+# link.exe.
+_LINK_EXE_OUT_ARG = re.compile('/OUT:(?P<out>.+)$', re.IGNORECASE)
+
+def main(args):
+  exit_code = WinTool().Dispatch(args)
+  if exit_code is not None:
+    sys.exit(exit_code)
+
+
+class WinTool(object):
+  """This class performs all the Windows tooling steps. The methods can either
+  be executed directly, or dispatched from an argument list."""
+
+  def _UseSeparateMspdbsrv(self, env, args):
+    """Allows to use a unique instance of mspdbsrv.exe per linker instead of a
+    shared one."""
+    if len(args) < 1:
+      raise Exception("Not enough arguments")
+
+    if args[0] != 'link.exe':
+      return
+
+    # Use the output filename passed to the linker to generate an endpoint name
+    # for mspdbsrv.exe.
+    endpoint_name = None
+    for arg in args:
+      m = _LINK_EXE_OUT_ARG.match(arg)
+      if m:
+        endpoint_name = re.sub(r'\W+', '',
+            '%s_%d' % (m.group('out'), os.getpid()))
+        break
+
+    if endpoint_name is None:
+      return
+
+    # Adds the appropriate environment variable. This will be read by link.exe
+    # to know which instance of mspdbsrv.exe it should connect to (if it's
+    # not set then the default endpoint is used).
+    env['_MSPDBSRV_ENDPOINT_'] = endpoint_name
+
+  def Dispatch(self, args):
+    """Dispatches a string command to a method."""
+    if len(args) < 1:
+      raise Exception("Not enough arguments")
+
+    method = "Exec%s" % self._CommandifyName(args[0])
+    return getattr(self, method)(*args[1:])
+
+  def _CommandifyName(self, name_string):
+    """Transforms a tool name like recursive-mirror to RecursiveMirror."""
+    return name_string.title().replace('-', '')
+
+  def _GetEnv(self, arch):
+    """Gets the saved environment from a file for a given architecture."""
+    # The environment is saved as an "environment block" (see CreateProcess
+    # and msvs_emulation for details). We convert to a dict here.
+    # Drop last 2 NULs, one for list terminator, one for trailing vs. separator.
+    pairs = open(arch).read()[:-2].split('\0')
+    kvs = [item.split('=', 1) for item in pairs]
+    return dict(kvs)
+
+  def ExecDeleteFile(self, path):
+    """Simple file delete command."""
+    if os.path.exists(path):
+      os.unlink(path)
+
+  def ExecRecursiveMirror(self, source, dest):
+    """Emulation of rm -rf out && cp -af in out."""
+    if os.path.exists(dest):
+      if os.path.isdir(dest):
+        def _on_error(fn, path, dummy_excinfo):
+          # The operation failed, possibly because the file is set to
+          # read-only. If that's why, make it writable and try the op again.
+          if not os.access(path, os.W_OK):
+            os.chmod(path, stat.S_IWRITE)
+          fn(path)
+        shutil.rmtree(dest, onerror=_on_error)
+      else:
+        if not os.access(dest, os.W_OK):
+          # Attempt to make the file writable before deleting it.
+          os.chmod(dest, stat.S_IWRITE)
+        os.unlink(dest)
+
+    if os.path.isdir(source):
+      shutil.copytree(source, dest)
+    else:
+      shutil.copy2(source, dest)
+      # Try to diagnose crbug.com/741603
+      if not os.path.exists(dest):
+        raise Exception("Copying of %s to %s failed" % (source, dest))
+
+  def ExecLinkWrapper(self, arch, use_separate_mspdbsrv, *args):
+    """Filter diagnostic output from link that looks like:
+    '   Creating library ui.dll.lib and object ui.dll.exp'
+    This happens when there are exports from the dll or exe.
+    """
+    env = self._GetEnv(arch)
+    if use_separate_mspdbsrv == 'True':
+      self._UseSeparateMspdbsrv(env, args)
+    if sys.platform == 'win32':
+      args = list(args)  # *args is a tuple by default, which is read-only.
+      args[0] = args[0].replace('/', '\\')
+    # https://docs.python.org/2/library/subprocess.html:
+    # "On Unix with shell=True [...] if args is a sequence, the first item
+    # specifies the command string, and any additional items will be treated as
+    # additional arguments to the shell itself.  That is to say, Popen does the
+    # equivalent of:
+    #   Popen(['/bin/sh', '-c', args[0], args[1], ...])"
+    # For that reason, since going through the shell doesn't seem necessary on
+    # non-Windows don't do that there.
+    pe_name = None
+    for arg in args:
+      m = _LINK_EXE_OUT_ARG.match(arg)
+      if m:
+        pe_name = m.group('out')
+    link = subprocess.Popen(args, shell=sys.platform == 'win32', env=env,
+                            stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    # Read output one line at a time as it shows up to avoid OOM failures when
+    # GBs of output is produced.
+    for line in link.stdout:
+      if (not line.startswith('   Creating library ') and
+          not line.startswith('Generating code') and
+          not line.startswith('Finished generating code')):
+        print(line)
+    result = link.wait()
+    if result == 0 and sys.platform == 'win32':
+      # Flush the file buffers to try to work around a Windows 10 kernel bug,
+      # https://crbug.com/644525
+      output_handle = win32file.CreateFile(pe_name, win32file.GENERIC_WRITE,
+                                      0, None, win32file.OPEN_EXISTING, 0, 0)
+      win32file.FlushFileBuffers(output_handle)
+      output_handle.Close()
+    return result
+
+  def ExecAsmWrapper(self, arch, *args):
+    """Filter logo banner from invocations of asm.exe."""
+    env = self._GetEnv(arch)
+    if sys.platform == 'win32':
+      # Windows ARM64 uses clang-cl as assembler which has '/' as path
+      # separator, convert it to '\\' when running on Windows.
+      args = list(args) # *args is a tuple by default, which is read-only
+      args[0] = args[0].replace('/', '\\')
+    popen = subprocess.Popen(args, shell=True, env=env,
+                             stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    out, _ = popen.communicate()
+    for line in out.splitlines():
+      if not line.startswith(' Assembling: '):
+        print(line)
+    return popen.returncode
+
+  def ExecRcWrapper(self, arch, *args):
+    """Converts .rc files to .res files."""
+    env = self._GetEnv(arch)
+
+    # We run two resource compilers:
+    # 1. A custom one at build/toolchain/win/rc/rc.py which can run on
+    #    non-Windows, and which has /showIncludes support so we can track
+    #    dependencies (e.g. on .ico files) of .rc files.
+    # 2. On Windows, regular Microsoft rc.exe, to make sure rc.py produces
+    #    bitwise identical output.
+
+    # 1. Run our rc.py.
+    # Also pass /showIncludes to track dependencies of .rc files.
+    args = list(args)
+    rcpy_args = args[:]
+    rcpy_args[0:1] = [sys.executable, os.path.join(BASE_DIR, 'rc', 'rc.py')]
+    rcpy_res_output = rcpy_args[-2]
+    assert rcpy_res_output.startswith('/fo')
+    assert rcpy_res_output.endswith('.res')
+    rc_res_output = rcpy_res_output + '_ms_rc'
+    args[-2] = rc_res_output
+    rcpy_args.append('/showIncludes')
+    rc_exe_exit_code = subprocess.call(rcpy_args, env=env)
+    if rc_exe_exit_code == 0:
+      # Since tool("rc") can't have deps, add deps on this script and on rc.py
+      # and its deps here, so that rc edges become dirty if rc.py changes.
+      print('Note: including file: ../../build/toolchain/win/tool_wrapper.py')
+      print('Note: including file: ../../build/toolchain/win/rc/rc.py')
+      print(
+          'Note: including file: ../../build/toolchain/win/rc/linux64/rc.sha1')
+      print('Note: including file: ../../build/toolchain/win/rc/mac/rc.sha1')
+      print(
+          'Note: including file: ../../build/toolchain/win/rc/win/rc.exe.sha1')
+
+    # 2. Run Microsoft rc.exe.
+    if sys.platform == 'win32' and rc_exe_exit_code == 0:
+      rc_exe_exit_code = subprocess.call(args, shell=True, env=env)
+      # Assert Microsoft rc.exe and rc.py produced identical .res files.
+      if rc_exe_exit_code == 0:
+        import filecmp
+        # Strip "/fo" prefix.
+        assert filecmp.cmp(rc_res_output[3:], rcpy_res_output[3:])
+    return rc_exe_exit_code
+
+  def ExecActionWrapper(self, arch, rspfile, *dirname):
+    """Runs an action command line from a response file using the environment
+    for |arch|. If |dirname| is supplied, use that as the working directory."""
+    env = self._GetEnv(arch)
+    # TODO(scottmg): This is a temporary hack to get some specific variables
+    # through to actions that are set after GN-time. http://crbug.com/333738.
+    for k, v in os.environ.items():
+      if k not in env:
+        env[k] = v
+    args = open(rspfile).read()
+    dirname = dirname[0] if dirname else None
+    return subprocess.call(args, shell=True, env=env, cwd=dirname)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))