Merge "Improve documentation and use Long instead of 64Bits" into sc-dev am: 9bb2b4cc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13430526

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie68a970e8df3f154459c96330d242d03a115bb15