Merge "Add a function to learn max # of elements we can add to message" into udc-dev am: a093b270

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22281771



Change-Id: Ib681d3323f7fe15b80ea4bc110cf1b4e9e956d4f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>