Merge "Have NetworkStats implements iterable" am: 589a43475c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1952101

Change-Id: I619d194086dfe6b88680e0a72e407694c02d3a2e
tree: 0166760d33aff4d863f9b2b07c7f1b01e545f23f
  1. core/
  2. framework/
  3. framework-t/
  4. service-t/
  5. services/
  6. tests/