Windows: Bootstrap Python first and get rid of Python 2.6 legacy

If loaded first, Python can then be used to replace JS bootstrapping
logic if appropriate libs are already present in depot_tools.

BUG=328453
AUTHOR=techtonik@gmail.com
R=iannucci@chromium.org, maruel@chromium.org

Review URL: https://codereview.chromium.org/140183007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@257248 0039d316-1c4b-4281-b951-d872f2087c98

bootstrap/win/pylint.new.bat

-@echo off
-:: Copyright (c) 2013 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.
-
-setlocal
-call python "%~dp0pylint.py" %*

bootstrap/win/win_tools.bat

@@ -25,6 +25,40 @@ if "%1" == "force" (
 )
 
 
+:PYTHON_CHECK
+if not exist "%WIN_TOOLS_ROOT_DIR%\python276_bin" goto :PY27_INSTALL
+if not exist "%WIN_TOOLS_ROOT_DIR%\python.bat" goto :PY27_INSTALL
+set ERRORLEVEL=0
+goto :GIT_CHECK
+
+
+:PY27_INSTALL
+echo Installing python 2.7.6...
+:: Cleanup python directory if it was existing.
+if exist "%WIN_TOOLS_ROOT_DIR%\python276_bin\." rd /q /s "%WIN_TOOLS_ROOT_DIR%\python276_bin"
+if exist "%ZIP_DIR%\python276.zip" del "%ZIP_DIR%\python276.zip"
+echo Fetching from %WIN_TOOLS_ROOT_URL%/third_party/python276_bin.zip
+cscript //nologo //e:jscript "%~dp0get_file.js" %WIN_TOOLS_ROOT_URL%/third_party/python276_bin.zip "%ZIP_DIR%\python276_bin.zip"
+if errorlevel 1 goto :PYTHON_FAIL
+:: Will create python276_bin\...
+cscript //nologo //e:jscript "%~dp0unzip.js" "%ZIP_DIR%\python276_bin.zip" "%WIN_TOOLS_ROOT_DIR%"
+:: Create the batch files.
+call copy /y "%~dp0python276.new.bat" "%WIN_TOOLS_ROOT_DIR%\python.bat" 1>nul
+call copy /y "%~dp0pylint.new.bat" "%WIN_TOOLS_ROOT_DIR%\pylint.bat" 1>nul
+del "%ZIP_DIR%\python276_bin.zip"
+set ERRORLEVEL=0
+goto :GIT_CHECK
+
+
+:PYTHON_FAIL
+echo ... Failed to checkout python automatically.
+echo Please visit http://python.org to download the latest python 2.7.x client before
+echo continuing.
+echo You can also get the "prebacked" version used at %WIN_TOOLS_ROOT_URL%/third_party/
+set ERRORLEVEL=1
+goto :END
+
+
 :GIT_CHECK
 if "%DEPOT_TOOLS_GIT_1852%" == "0" goto :GIT_1852_UNINSTALL
 goto :GIT_1852_CHECK
@@ -121,11 +155,11 @@ goto :END
 
 :SVN_CHECK
 :: If the batch file exists, skip the svn check.
-if exist "%WIN_TOOLS_ROOT_DIR%\svn.bat" goto :PYTHON_CHECK
+if exist "%WIN_TOOLS_ROOT_DIR%\svn.bat" goto :END
 if "%WIN_TOOLS_FORCE%" == "1" goto :SVN_INSTALL
 call svn --version 2>nul 1>nul
 if errorlevel 1 goto :SVN_INSTALL
-goto :PYTHON_CHECK
+goto :END
 
 
 :SVN_INSTALL
@@ -146,7 +180,7 @@ del "%ZIP_DIR%\svn.zip"
 :: Create the batch file.
 call copy /y "%~dp0svn.new.bat" "%WIN_TOOLS_ROOT_DIR%\svn.bat" 1>nul
 call copy /y "%~dp0svnversion.new.bat" "%WIN_TOOLS_ROOT_DIR%\svnversion.bat" 1>nul
-goto :PYTHON_CHECK
+goto :END
 
 
 :SVN_FAIL
@@ -158,68 +192,6 @@ set ERRORLEVEL=1
 goto :END
 
 
-:PYTHON_CHECK
-:: Note: while the variable talks about 2.7.5, we are now installing 2.7.6.
-:: Sorry for the confusion. :(
-if "%DEPOT_TOOLS_PYTHON_275%" == "0" goto :PY26_CHECK
-if "%DEPOT_TOOLS_PYTHON_27%" == "0" goto :PY26_CHECK
-goto :PY27_CHECK
-
-
-:PY26_CHECK
-if not exist "%WIN_TOOLS_ROOT_DIR%\python_bin" goto :PY26_INSTALL
-if not exist "%WIN_TOOLS_ROOT_DIR%\python.bat" goto :PY26_INSTALL
-set ERRORLEVEL=0
-goto :END
-
-
-:PY27_CHECK
-if not exist "%WIN_TOOLS_ROOT_DIR%\python276_bin" goto :PY27_INSTALL
-if not exist "%WIN_TOOLS_ROOT_DIR%\python.bat" goto :PY27_INSTALL
-set ERRORLEVEL=0
-goto :END
-
-
-:PY27_INSTALL
-echo Installing python 2.7.6...
-:: Cleanup python directory if it was existing.
-if exist "%WIN_TOOLS_ROOT_DIR%\python276_bin\." rd /q /s "%WIN_TOOLS_ROOT_DIR%\python276_bin"
-if exist "%ZIP_DIR%\python276.zip" del "%ZIP_DIR%\python276.zip"
-echo Fetching from %WIN_TOOLS_ROOT_URL%/third_party/python276_bin.zip
-cscript //nologo //e:jscript "%~dp0get_file.js" %WIN_TOOLS_ROOT_URL%/third_party/python276_bin.zip "%ZIP_DIR%\python276_bin.zip"
-if errorlevel 1 goto :PYTHON_FAIL
-:: Will create python276_bin\...
-cscript //nologo //e:jscript "%~dp0unzip.js" "%ZIP_DIR%\python276_bin.zip" "%WIN_TOOLS_ROOT_DIR%"
-:: Create the batch files.
-call copy /y "%~dp0python276.new.bat" "%WIN_TOOLS_ROOT_DIR%\python.bat" 1>nul
-call copy /y "%~dp0pylint.new.bat" "%WIN_TOOLS_ROOT_DIR%\pylint.bat" 1>nul
-del "%ZIP_DIR%\python276_bin.zip"
-set ERRORLEVEL=0
-goto :END
-
-
-:PY26_INSTALL
-echo Installing python 2.6...
-:: Cleanup python directory if it was existing.
-if exist "%WIN_TOOLS_ROOT_DIR%\python_bin\." rd /q /s "%WIN_TOOLS_ROOT_DIR%\python_bin"
-call svn co -q %WIN_TOOLS_ROOT_URL%/third_party/python_26 "%WIN_TOOLS_ROOT_DIR%\python_bin"
-if errorlevel 1 goto :PYTHON_FAIL
-:: Create the batch files.
-call copy /y "%~dp0python.new.bat" "%WIN_TOOLS_ROOT_DIR%\python.bat" 1>nul
-call copy /y "%~dp0pylint.new.bat" "%WIN_TOOLS_ROOT_DIR%\pylint.bat" 1>nul
-set ERRORLEVEL=0
-goto :END
-
-
-:PYTHON_FAIL
-echo ... Failed to checkout python automatically.
-echo Please visit http://python.org to download the latest python 2.7.x client before
-echo continuing.
-echo You can also get the "prebacked" version used at %WIN_TOOLS_ROOT_URL%/third_party/
-set ERRORLEVEL=1
-goto :END
-
-
 :returncode
 set WIN_TOOLS_ROOT_URL=
 set WIN_TOOLS_ROOT_DIR=