Merge "Mark Message.peekData as returning a nullable value." into main am: 9727fd349b am: 0aeda451f4 am: 19deb68a1e

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

Change-Id: Icca5f752ded79d015115f662c32c833e0d4dbc68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>