Merge "Allow appending members to structs and classes" am: efd3826863 am: f3c5194bf2 am: e0f5ee63db

Original change: https://android-review.googlesource.com/c/platform/development/+/2229078

Change-Id: I68d42cfe2779eee010447a0e0d3c68f346d546ff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>