Add history_answer.proto to Chrome.

Bug: b/345502171
Change-Id: If9ef894e273848ff3485dd637dfb1a77ebf64007
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5606214


Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Max Curran <curranmax@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312946}