Download or update Mac toolchain for pdfium

Add Mac toolchain update logic to check whether toolchain should be
downloaded. For googlers, it should be downloaded by default. This fix
the current sdk directory couldn't be found problem.

For googlers who want to opt out of using toolchain, set "use_system_xcode
= true" in gn config.

Review-Url: https://codereview.chromium.org/2515833002

1 files changed, 6 insertions, 0 deletions

diff --git a/DEPS b/DEPS
index 4d5507428e..e9c50143f6 100644
--- a/DEPS
+++ b/DEPS
@@ -185,6 +185,12 @@ hooks = [
     'action': ['python', 'pdfium/build/vs_toolchain.py', 'update'],
   },
   {
+    # Update the Mac toolchain if necessary.
+    'name': 'mac_toolchain',
+    'pattern': '.',
+    'action': ['python', 'pdfium/build/mac_toolchain.py'],
+  },
+  {
     # Pull sanitizer-instrumented third-party libraries if requested via
     # GYP_DEFINES.
     'name': 'instrumented_libraries',