Merge "Added forward declaration for compilation" am: 233a5a16 am:...

Merge "Added forward declaration for compilation" am: 233a5a16 am: 5eab5a8d am: 5cc7d0d5 am: 4955ad08

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2516555



Change-Id: I32adfa050d61e179e4e3df370dcdb328a012bec7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>