Merge "Add javadoc to NetworkStats related classes." am: b69c56683c am: cfd6585d9d am: c9ce1c0c75 am: 48106a9f58

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1917019

Change-Id: Ifcd393b558059c2d153dc2a419b3fe7617004830
tree: dff774d31c1ed7d683e33cccc3a33c292936688f
  1. core/
  2. framework/
  3. framework-t/
  4. service-t/
  5. services/
  6. tests/