Merge "Add a tool to dump git SHAs of API changes" am: 457ccf2d32 am: 20deed1e69 am: eed7191d86

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1652488

Change-Id: Ia5a1269f650b9c9214a5499f18d1375cf5856b62