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

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

Change-Id: I4eac02aaf2db7985859b8752659c5f7a2f833c40
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>