tree 6a65d5f0a2a04abc09c2d9ece595076e5be517f4
parent 6f8afdc501208897ad8e47add5426632e82ebaee
author Jeff Sharkey <jsharkey@android.com> 1504291911 -0600
committer Jeff Sharkey <jsharkey@android.com> 1504307581 -0600

Gracefully handle integer overflows.

Try sticking with integer-based math as much as possible for speed,
but switch to double-based math if we detect that we'd end up
causing an overflow.

New tests to verify.

Test: bit FrameworksNetTests:com.android.server.net.NetworkStatsCollectionTest
Bug: 65257769
Change-Id: I1ae35599be134f81850c0a3d86928b057fba1eff