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This CL adds some mouse hover handling to the omnibox Views headers,
analogous to what OmniboxResultView already has.

The logic is slightly duplicative but I would hesitate to add any
abstraction at this point, given the experimental nature of the
feature, as well as the fact that it's just two locations.

Bug: 1052522
Change-Id: Ib0211c1e168bf17e0ff6ad487cc43c986801e064
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145077Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758207}