Use visual studio toolchain from depot_tools for PDFium compilation

Change to use visual studio toolchain from depot_tools by default.
Setting DEPOT_TOOLS_WIN_TOOLCHAIN=0 allows compilation using system
toolchain as before.

Using toolchain from depot_tools unifies the compilation
environment, and brings the benefits of automated update, bug fixes
etc.

Review-Url: https://codereview.chromium.org/1897523002

1 files changed, 6 insertions, 0 deletions

diff --git a/DEPS b/DEPS
index 7fb3a32b6e..1a08ef31eb 100644
--- a/DEPS
+++ b/DEPS
@@ -169,4 +169,10 @@ hooks = [
                '--if-needed'
     ],
   },
+  {
+    # Update the Windows toolchain if necessary.
+    'name': 'win_toolchain',
+    'pattern': '.',
+    'action': ['python', 'pdfium/build_gyp/vs_toolchain.py', 'update'],
+  },
 ]