Merge "Allow appending members to structs and classes" am: efd3826863 am: f3c5194bf2 am: e0f5ee63db am: 9e14193cfc

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

Change-Id: Ia76a8a4177b247622951b0cc9a8f48f8357d7b5c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>