Merge "Add binary to write basic COW" into main am: 0fc7feeafb

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2763849

Change-Id: I57488d1893a80bf44e5c3b12ec6f014691329c77
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>