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See the bug for screenshots.

Currently, the selection bounds in the Omnibox are not vertically
symmetric. This is becoming a lot more noticeable with the MD Refresh
redesign.

This CL extends RenderText to allow expanding the selection bounds to
be vertically symmetric with respect to the display rect.

This CL only turns on this flag for the OmniboxViewViews.

Bug: 249065
Change-Id: I031017335a0efb5e8842d137fc55efce5520e6cd
Reviewed-on: https://chromium-review.googlesource.com/1140901
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575887}