Update vs_toolchain.py build hook.

Update the hook to match the hook of the same name in Chromium. This is
needed to support win-cross builds for standalone PDFium.

Change-Id: Ib8a44aedc2e33a15880c51f4e7ee53a4fc7f5682
Reviewed-on: https://pdfium-review.googlesource.com/21971
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/DEPS b/DEPS
index 929a7c6234..7abc60f16e 100644
--- a/DEPS
+++ b/DEPS
@@ -249,7 +249,8 @@ hooks = [
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
-    'action': ['python', 'pdfium/build/vs_toolchain.py', 'update'],
+    'condition': 'checkout_win',
+    'action': ['vpython', 'pdfium/build/vs_toolchain.py', 'update', '--force'],
   },
   {
     # Update the Mac toolchain if necessary.