Merge "Add OWNERS for UsageStats related classes." am: e9f11554d6 am: 08b23493b5 am: 0c3e7453a2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1959074

Change-Id: I2873059b8e07dcd81c45529632e3dc543135246a