Merge "Add atom for general external storage access stats" into rvc-dev am: 1274e01a37 am: 1922ce9f3b

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

Change-Id: Ia209bc0a417613abbfe8b0a09f3b8a9274a64dfc
tree: 55665c9cbdb279c70e65c359203760233f68ec69
  1. stats/