Merge "procrank: add flag to filter descendants." am: cfad4b1ec6 am: 0bc5d7f55b am: 74f9418904 am: 21baa9e0a0

Original change: https://android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/1861901

Change-Id: Idfb25ef903cbdbc445f3f7e5a00b9d8eff13613b