Merge "Mark Message.peekData as returning a nullable value." into main am: 9727fd349b am: ef6101d598 am: e278ff4377

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2781849

Change-Id: I9a598c10f598d00f44d4e70b5b435e07110b31e2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>