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)

Change-Id: I46da93ba4afa968facf98f7c3d844fd0c469095a
11 files changed