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This change introduces a TILE_NAVSUGGEST suggestion type for the
most-visited suggestions.
The TILE_NAVSUGGEST is built in a similar way to NAVSUGGEST and
TILE_SUGGEST elements, where a list of tiles is held as a vector of
elements arranged in the order these are scored.

The TILE_NAVSUGGEST is currently meant specifically for zero-prefix
most-visited URL suggestions and should be positioned below the
QueryTiles. These elements are currently not meant to be
cached as these URLs are used specifically when user is visiting a
website (ie. not a ZPS on a NTP).

The change does not create any logic wiring up TILE_NAVSUGGEST items;
instead, it simply creates a new suggestion type and adds
corresponding data to that object on both Native and Java sides.

Change-Id: Ia4c5141143d6a49f963bcf66fecae9b84d3d4b5e
Doc: http://doc/1IFsDKYhy_ARMOdT8jd1pMtk497xe03lb3hVnsaY-dOM
Slides: http://slides/1c1SzJLzEsTjLmqIVLTomC8l9EgslBgYaBN6I7t8mbDI#slide=id.g8b3736bab3_0_0
Figma: https://www.figma.com/file/h8qjD0s9tezRzHdCMxIhYJ/On-Focus-Suggestions?node-id=290%3A309
Bug: 1106109
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422808
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810285}