roll: third_party/pigweed 2 commits

a27a7371c69cb58 docs: Update changelog
990ed9bb2f16bec pw_unit_test: Introduce googtest_platform

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e15bd2067e7a244..a27a7371c69cb58
Roller-URL: https://ci.chromium.org/b/8742575055934908513
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iabc6a94b14c7b5b2a0a06fec01841e597f34fe66
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/222855
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.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 e15bd20..a27a737 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e15bd2067e7a244ff3d8d2c33468407865367af3
+Subproject commit a27a7371c69cb5820803be9ce842dd7242fb675a