commit 6d745cc0a889a821fd286ee3d9cd98a8ef9d306d
author junyulai <junyulai@google.com> Tue Mar 31 14:56:01 2020 +0800
committer junyulai <junyulai@google.com> Wed Apr 01 16:46:08 2020 +0800
tree 844592766d5571afcc494eedc97cf64fd09ca716
parent e1f0d9a0d325024472cc9e29453add68e4d56fae

[SP26.2] add a method in NetworkStats that removes empty entries

In current design, entries with zeros are preserved after
addition/subtraction. These entries are not very useful
and lead to difficulty of verifying the result of
addition/subtraction.

However, change the behavior in the original NetworkStats
is considered risky in current stage.

Thus, this change provide a function that could remove these
empty entries in tests.

Test: atest FrameworksNetTests
Bug: 152827872
Bug: 150644692
Change-Id: I40a76935d55712b8083ee1e17e137a8a4ef5e029