[automerger skipped] [Mobile] Wrap AccessibilityContentDescriptions in a static getter am: 65e73e304c -s ours

am skip reason: Merged-In Ifa55ad8184a5337390d9fa245311b4e9513c0233 with SHA-1 6e67f7d492 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26970078

Change-Id: I6acb789df14edf68f95bff9f3fdc70dca8e07555
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>