v3 cow estimator am: c717f7a3d0 am: c52497efb3

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2954147

Change-Id: Ie054a55e9195e38636ab30742cad5fa44a404dc3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>