Adding tracing to VoteStorage updates

Bug: b/297933745
Test: maunal testing, see comment 11
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:afa2a63899294c4734fe58b5bbed2439f329d241)
Merged-In: I7f19e092f9f747e89e36bc756606b380953cea93
Change-Id: I7f19e092f9f747e89e36bc756606b380953cea93
1 file changed