Stabilize native dependency sync

scripts/build-linux-static-graphics.sh

@@ -11,6 +11,7 @@ ANGLE_BRANCH="${ANGLE_BRANCH:-7151}"
 BUILD_JOBS="${BUILD_JOBS:-$(nproc)}"
 ANGLE_PATCH_DIR="${ANGLE_PATCH_DIR:-$ROOT_DIR/External/NativeStatic/patches}"
 LLVM_AR="${LLVM_AR:-llvm-ar-19}"
+SKIA_DEPS_RETRIES="${SKIA_DEPS_RETRIES:-3}"
 
 usage() {
   cat <<'USAGE'
@@ -69,10 +70,37 @@ sync_skiasharp() {
   echo "$src"
 }
 
+prepare_skia_git_sync_deps() {
+  local sync_deps="$1/tools/git-sync-deps"
+  python3 - "$sync_deps" <<'PY'
+import pathlib
+import sys
+
+path = pathlib.Path(sys.argv[1])
+text = path.read_text()
+old = "  multithread(git_checkout_to_directory, list_of_arg_lists)"
+new = "  for args in list_of_arg_lists:\n    git_checkout_to_directory(*args)"
+if old in text:
+    path.write_text(text.replace(old, new))
+PY
+}
+
 sync_skia_deps() {
   local skia_dir="$1/externals/skia"
   if [[ ! -x "$skia_dir/bin/gn" ]]; then
-    python3 "$skia_dir/tools/git-sync-deps"
+    prepare_skia_git_sync_deps "$skia_dir"
+
+    local attempt
+    for attempt in $(seq 1 "$SKIA_DEPS_RETRIES"); do
+      if python3 "$skia_dir/tools/git-sync-deps"; then
+        return 0
+      fi
+      if [[ "$attempt" == "$SKIA_DEPS_RETRIES" ]]; then
+        return 1
+      fi
+      echo "git-sync-deps failed; retrying ($attempt/$SKIA_DEPS_RETRIES)..." >&2
+      sleep 10
+    done
   fi
 }