NetworkStats.Bucket API polish.

-Add @IntDef constants for STATE_ and ROAMING_.
-Expand docs for ROAMING_ constants.
-Use ROAMING_NO/YES instead of ROAMING_DEFAULT/ROAMING.

Bug: 27531260
Change-Id: I54ecfb4148caa549214df0bee9983036ffa4cb55
4 files changed
tree: 8d149bc7fea54bcd3a17ee7541c6f374cf0216df
  1. core/
  2. services/
  3. tests/