tree dd9e94fa1e7d814f141163825976809a71293f15
parent 9c1c9c2acbfacd0ad96d06e77165a0d7089b1ced
author Doris Ling <dling@google.com> 1538085462 -0700
committer Doris Ling <dling@google.com> 1538177982 -0700

Add loader for net cycle data for specific Uid.

- Add the loader to retrive usage data for a particular uid.
- restructure the NetworkCycleData and the loader:
  - NetworkCycleData now becomes the base class of the cycle data. It
  only contains the cycle start/end and the total usage.
  - Add NetworkCycleChartData which has the bucketized usage for
  plotting the usage chart.
  - Add NetworkCycleDataForUid which shows detail usage for a specific
  app.

Bug: 111751694
Test: make RunSettingsLibRoboTests
Change-Id: Ifd95445730429373dc45aaceae37eb0d79b4377c