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

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

Change-Id: I79aa03b164dae4374024a1cfb45c0da3a0e9140d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>