tree a3c236c34c260fe31d302219e42f254b00cddab1
parent 3091498e78ce7c3e4e71011070e3860da206cf92
author junyulai <junyulai@google.com> 1581490554 +0800
committer junyulai <junyulai@google.com> 1581671015 +0800

[SP17] Wait for stats providers to report stats update

From current design, the traffic accounted by stats providers
will be updated asynchronously when force polling. When upper
layer make two subsequently queries. They will get stale
stats upon the first query, and may get newest/stale stats
base on the result of race.

Thus, wait for a bit of time to allow asynchronous stats update
complete to reduce the chance of race. In pratice, it would
be finished in ~2ms when testing.

Test: systrace.py network
Test: atest FrameworksNetTests
Bug: 147460444
Change-Id: I22a00fc4049cddf77fd578e25769ae1979f2cc6d