Merge "Add atom for general external storage access stats" into rvc-dev am: 1274e01a37

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11894164

Change-Id: Ic1fa3787b34d1d4073ed96d268cc7802ec5bde44
tree: c803bab7440b7397b3c715a96f8bcf0d7d8a50bd
  1. stats/