Merge "Add a function to determine cow op size" into main am: b86b339cb4

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3501718

Change-Id: I8e470c46f1d54787b24746a6b41f0514766c2f04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>