Achieve feature pairity with pre 2.7.4

bootstrap/win/win_tools.bat

 @echo off
 :: 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.
 
 :: This script will try to find if svn and python are accessible and it not,
 :: it will try to download it and 'install' it in depot_tools.
 
 :: Sadly, we can't use SETLOCAL here otherwise it ERRORLEVEL is not correctly
 :: returned.
@@ skipping 90 matching lines @@
 
 if "%WIN_TOOLS_FORCE%" == "1" goto :GIT_INSTALL
 
 if exist "%GIT_EXE_PATH%" (
   call "%GIT_EXE_PATH%" --version 2>nul 1>nul
   if errorlevel 1 goto :GIT_INSTALL
   rem Several git versions can live side-by-side; check the top-level
   rem batch script to make sure it points to the desired version.
   find "%GIT_BIN_DIR%" "%WIN_TOOLS_ROOT_DIR%\git.bat" 2>nul 1>nul
   if errorlevel 1 goto :GIT_MAKE_BATCH_FILES
-  goto :SVN_CHECK
+  goto :SYNC_GIT_HELP_FILES
 )
 goto :GIT_INSTALL
 
 :GIT_INSTALL
 echo Installing git %GIT_VERSION% (avg 1-2 min download) ...
 echo Detected: %OS_BITS% bits
 if defined XP_SUFFIX         echo ... Windows XP
 if defined GIT_PORTABLE_FLOW echo ... Portable installation flow
 
 :: git is not accessible; check it out and create 'proxy' files.
@@ skipping 35 matching lines @@
   call copy /y "%WIN_TOOLS_ROOT_DIR%\%GIT_BIN_DIR%\gitk.bat" "%WIN_TOOLS_ROOT_DIR%\gitk.bat" 1>nul
   call copy /y "%WIN_TOOLS_ROOT_DIR%\%GIT_BIN_DIR%\ssh.bat" "%WIN_TOOLS_ROOT_DIR%\ssh.bat" 1>nul
   call copy /y "%WIN_TOOLS_ROOT_DIR%\%GIT_BIN_DIR%\ssh-keygen.bat" "%WIN_TOOLS_ROOT_DIR%\ssh-keygen.bat" 1>nul
 )
 
 :: Ensure autocrlf and filemode are set correctly.
 call "%WIN_TOOLS_ROOT_DIR%\git.bat" config --system core.autocrlf false
 call "%WIN_TOOLS_ROOT_DIR%\git.bat" config --system core.filemode false
 call "%WIN_TOOLS_ROOT_DIR%\git.bat" config --system core.preloadindex true
 call "%WIN_TOOLS_ROOT_DIR%\git.bat" config --system core.fscache true
+
+:SYNC_GIT_HELP_FILES
+:: Copy all the depot_tools docs into the mingw64 git docs root.
+:: /i : Make sure xcopy knows that the destination names a folder, not a file
+:: /q : Make xcopy quiet (though it still prints a `X File(s) copied` message
+::      which is why we have the > NUL)
+:: /d : Copy source files that are newer than the corresponding destination
+::      files only. This prevents excessive copying when none of the docs
+::      actually changed.
+:: /y : Don't prompt for overwrites (yes)
+if defined GIT_PORTABLE_FLOW (
+  xcopy /i /q /d /y "%WIN_TOOLS_ROOT_DIR%\man\html\*" "%GIT_INST_DIR%\mingw64\share\doc\git-doc" > NUL
+)
 goto :SVN_CHECK
 
-
 :GIT_FAIL
 echo ... Failed to checkout git automatically.
 echo You should get the "prebaked" version used at %GIT_FETCH_URL%
 set ERRORLEVEL=1
 goto :END
 
 
 :SVN_CHECK
 :: If the batch file exists, skip the svn check.
 if exist "%WIN_TOOLS_ROOT_DIR%\svn.bat" goto :END
@@ skipping 31 matching lines @@
 goto :END
 
 
 :returncode
 set WIN_TOOLS_ROOT_URL=
 set WIN_TOOLS_ROOT_DIR=
 exit /b %ERRORLEVEL%
 
 :END
 call :returncode %ERRORLEVEL%