Escape slashes in paths in windows tool bootstrapping.

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 96 matching lines @@
 cscript //nologo //e:jscript "%~dp0get_file.js" %GIT_FETCH_URL% "%GIT_DOWNLOAD_PATH%"
 if errorlevel 1 goto :GIT_FAIL
 :: Cleanup git directory if it already exists.
 if exist "%GIT_INST_DIR%\." rd /q /s "%GIT_INST_DIR%"
 
 :: run PortableGit self-extractor
 :: -y : Be Quiet ("yes")
 :: -sd1 : Self delete SFX archive
 :: -InstallPath : Where to put the files
 :: -Directory : Run the post-extract program with this current-working-directory
-call "%GIT_DOWNLOAD_PATH%" -y -sd1 -InstallPath="%GIT_INST_DIR%" -Directory="%GIT_INST_DIR%"
+::
+:: Path slashes must be escaped or the 7zip sfx treats e.g. path\to\dir as
+::   path[tab]o\dir.
+set GIT_INST_DIR_ESC=%GIT_INST_DIR:\=\\%
+call "%GIT_DOWNLOAD_PATH%" -y -sd1 -InstallPath="%GIT_INST_DIR_ESC%" -Directory="%GIT_INST_DIR_ESC%"
 if errorlevel 1 goto :GIT_FAIL
 
 del "%GIT_DOWNLOAD_PATH%"
 if not exist "%GIT_INST_DIR%\." goto :GIT_FAIL
 
 :GIT_MAKE_BATCH_FILES
 :: Create the batch files.
 set GIT_TEMPL=%~dp0git.template.bat
 set SED=%GIT_INST_DIR%\usr\bin\sed.exe
 call "%SED%" -e "s/GIT_BIN_DIR/%GIT_BIN_DIR%/" -e "s/GIT_PROGRAM/cmd\\\\git.exe/" < %GIT_TEMPL% > "%WIN_TOOLS_ROOT_DIR%\git.bat"
@@ skipping 64 matching lines @@
 goto :END
 
 
 :returncode
 set WIN_TOOLS_ROOT_URL=
 set WIN_TOOLS_ROOT_DIR=
 exit /b %ERRORLEVEL%
 
 :END
 call :returncode %ERRORLEVEL%