Before this CL, the test only checks Local State, now it checks the seed
file, to make sure that the seed is stored in a file.
To achieve that, it changes the way that the seed is injected into the
test, so when it inject a seed, it writes to both Local State and the
VariationsSeedV1 file.
Also it waits if a write is in progress, to make sure the check happens
after the seed is written.
Bug: 413580167
Change-Id: Iac24ccfda2859afaf86643905d18c1042eea65ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6546896
Reviewed-by: Ernest Nguyen Hung <ernn@google.com>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Commit-Queue: Ramon Cano Aparicio <rcanoaparicio@google.com>
Cr-Commit-Position: refs/heads/main@{#1464597}
37bab131cd