Windows-specific improvements (ARM64 and Python) (#3255)

utils/clone.py

@@ -268,7 +268,7 @@ def main():
     parser.add_argument('-p',
                         '--pgo',
                         default='linux',
-                        choices=('linux', 'mac', 'mac-arm', 'win32', 'win64'),
+                        choices=('linux', 'mac', 'mac-arm', 'win32', 'win64', 'win-arm64'),
                         help='Specifiy which pgo profile to download.  Default: %(default)s')
     parser.add_argument('-s',
                         '--sysroot',

utils/depot_tools.patch

@@ -115,3 +115,11 @@
  
  # Google OAuth Context required by gsutil.
  LUCI_AUTH_SCOPES = [
+--- a/gclient.bat
++++ b/gclient.bat
+@@ -20,4 +20,4 @@ IF %ERRORLEVEL% NEQ 0 (
+ set PATH=%PATH%;%~dp0
+ 
+ :: Defer control.
+-call vpython3 "%~dp0gclient.py" %*
++call python3 "%~dp0gclient.py" %*