Add single file compile support for Windows in ninja wrappers

ninja.bat can't pass '^' for single file compile.
This change fixes ninja.bat to apply double quotas to args to preserve "^".
Note that ninja.bat still needs "^^" since single "^" is already removed  as an escape character.
This is the same implementation with autoninja.{bat, py}.

Test: http://go/paste/6182226814304256

Bug: 1340825
Change-Id: I183c7890634a77471a617c4cc2b9c8c33bc8487d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4060603
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Auto-Submit: Junji Watanabe <jwata@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Junji Watanabe <jwata@google.com>

ninja.bat

@@ -9,4 +9,4 @@ setlocal
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-python3 "%~dp0\ninja.py" %*
+python3 "%~dp0\ninja.py" "%*"

ninja.py

@@ -67,6 +67,14 @@ def fallback(ninja_args):
 
 
 def main(args):
+  # On Windows the ninja.bat script passes along the arguments enclosed in
+  # double quotes. This prevents multiple levels of parsing of the special '^'
+  # characters needed when compiling a single file.  When this case is detected,
+  # we need to split the argument. This means that arguments containing actual
+  # spaces are not supported by ninja.bat, but that is not a real limitation.
+  if (sys.platform.startswith('win') and len(args) == 2):
+    args = args[:1] + args[1].split(' ')
+
   # Get gclient root + src.
   primary_solution_path = gclient_paths.GetPrimarySolutionPath()
   gclient_root_path = gclient_paths.FindGclientRoot(os.getcwd())