Merge "Limit the size of NotificationChannel and NotificationChannelGroup"...

Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into rvc-qpr-dev am: a15093de am: 5415ede5 am: 5d93b514

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19696124



Change-Id: I0d71dffdc6130e6ca0c258688ab075fd75c59273
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>