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This change introduces PageClassification for SearchActivity
and brings back the SearchActivity suggestions.

The unique ID allocated to Search Activity will help us
clear up any inconsistencies in offered suggestions,
address SA directly and eliminate the use of the
INVALID_SPEC PageClassification (currently reported by SA).

Bug: 1143557
Change-Id: I3f48074079a9046d7aea25af9f5f2dc1f84ba268
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2516970Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#824686}