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Add tab_search:measure_memory:before and tab_search:measure_memory:after
to measure memory before/after open tab search.
Add tab_search:clean_slate to benchmark tab search without any traffic.

Bug: 1099917
Change-Id: I748609a91af8866c9814ff0cf2a17e92dd197d5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622951Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842613}