tree f1188e0bf560a2039db3ffc1f4725d2649061e47
parent b64a7de540d5a469b7ef2fff9d64dc23d1f6996c
author Hiroshi Sumita <hsumita@google.com> 1430607921 -0700
committer Yohei Yukawa <yukawa@google.com> 1430607921 -0700

Add usage stats for mushroom.

Note that usage stats is never be enabled in OSS build.
Hence no behavior change should occur.

BUG=none
TEST=unittest