[roll third_party/pigweed] pw_presubmit: Additional functions for handling gn args

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/170594

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e0b85213d6493b7..de3b1ca6a8cae37
Roller-URL: https://ci.chromium.org/b/8770125450861166769
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4e13eac8e4eaa0440afa28aec7b8b09335d1e884
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/170598
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index e0b8521..de3b1ca 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e0b85213d6493b72d9d93019f8577b8cfb89867c
+Subproject commit de3b1ca6a8cae370fe6c5fb925a1a712633198a2