[Unop2][Android] Do not record FRE histogram outside of FRE

Bug: 41493788
Change-Id: Id94afdf0432faba17179af85c58c113b5abe40a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5613970


Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Auto-Submit: Samar Chehade-Lepleux <samarchehade@google.com>
Commit-Queue: Samar Chehade-Lepleux <samarchehade@google.com>
Cr-Commit-Position: refs/heads/main@{#1312896}