Windows: Fix ImportError: No module named win32file (see https://crbug.com/1033106)

patch/patch.cfg

@@ -468,4 +468,9 @@ patches = [
     # https://bitbucket.org/chromiumembedded/cef/issues/2745
     'name': 'osr_fling_2745',
   },
+  {
+    # Windows: Fix ImportError: No module named win32file
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1033106#c7
+    'name': 'win_tool_wrapper_1033106',
+  }
 ]

patch/patches/win_tool_wrapper_1033106.patch

@@ -0,0 +1,67 @@
+diff --git build/toolchain/win/tool_wrapper.py build/toolchain/win/tool_wrapper.py
+index e5cc81b1fde7..d32cd8779948 100644
+--- build/toolchain/win/tool_wrapper.py
++++ build/toolchain/win/tool_wrapper.py
+@@ -17,50 +17,6 @@ import subprocess
+ import stat
+ import sys
+ 
+-# Embedded vpython spec to provide `win32file` when this is invoked with
+-# vpython on windows.
+-#
+-# [VPYTHON:BEGIN]
+-# wheel: <
+-#   name: "infra/python/wheels/pypiwin32/${vpython_platform}"
+-#   version: "version:219"
+-#   match_tag: < platform: "win32" >
+-#   match_tag: < platform: "win_amd64" >
+-# >
+-# [VPYTHON:END]
+-
+-if sys.platform == "win32":
+-  try:
+-    # First, try the normal way. This will work for python installations which
+-    # have win32file already, or for vpython invocations of this script.
+-    import win32file
+-  except ImportError:
+-    # Otherwise, do a hack to locate the depot_tools specific version of
+-    # win32file.
+-    #
+-    # 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
+-
+-  def superflush(pe_name):
+-    # 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()
+-else:
+-  def superflush(pe_name):
+-    return None
+-
+ BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+ 
+ # A regex matching an argument corresponding to the output filename passed to
+@@ -188,10 +144,7 @@ class WinTool(object):
+           not line.startswith('Generating code') and
+           not line.startswith('Finished generating code')):
+         print(line)
+-    result = link.wait()
+-    if result == 0 and sys.platform == 'win32':
+-      superflush(pe_name)
+-    return result
++    return link.wait()
+ 
+   def ExecAsmWrapper(self, arch, *args):
+     """Filter logo banner from invocations of asm.exe."""