Add query to fake delegate search function in view unit test

This is a prerequisite to testing whether the search query is trimmed in
a future CL.

Bug: b:356977533
Change-Id: I6a6a2100038ca24b03a01ddc8d7b7032e9a1bcfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5783378
Commit-Queue: Darren Shen <shend@chromium.org>
Auto-Submit: Michael Cui <mlcui@google.com>
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Michael Cui <mlcui@google.com>
Cr-Commit-Position: refs/heads/main@{#1341454}