Merge "Added forward declaration for compilation" am: 233a5a162d am: 5eab5a8d53 am: 5cc7d0d5b9

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

Change-Id: I4f8f109b821cdea76359bd530f8525050ea635e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>