Merge "libsnapshot: Add a tool for estimating non-A/B OTA sizes with the new...

Merge "libsnapshot: Add a tool for estimating non-A/B OTA sizes with the new COW format." am: f9a436a0 am: 9bd7d9bd

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1411189

Change-Id: I52d56946dd488834292a06cd2d2338544fbb6552