DO NOT MERGE: Implement metered tracking for NetworkStats summary queries.

Dependent on ag/1550196 where API is defined.

Bug: 31015360
Bug: 26545374
Test: runtest --path
frameworks/base/core/tests/coretests/src/android/net/NetworkStatsTest.java,
other test classes.

(cherry picked from commit 25147878974f82f875062e99cdee85dd33f3f078)

(cherry picked from commit 963e8ddf6d5ea3bc34216fa03fe24402bf13940a)

Change-Id: I79e401fc4159264a075febba82bd8c295b8e677f
11 files changed