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 am: 680c5e3a

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

Change-Id: I2ac302e32b8c106be8a0bce5344d7abe98c79079