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Adds a webui optimized configuration for the 'Tab Search' feature. The resulting code reduces the number of network requests. Pinpoint benchmarks collected below suggest the webui optimized version of 'Tab Search' performs better in low end device scenarios.

Pinpoint results spreadsheet: https://docs.google.com/spreadsheets/d/1sKon_KLA3dU0iASJ24BBFAq4qa_R0q5r3L9uPHmCwXU/edit#gid=1996236618 details and summary included in the crbug.

Fixed: 1157194
Change-Id: I833a300f94a37296064b8c7db19c1d8e7a9ace1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529733Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Commit-Queue: Roman Arora <romanarora@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836131}