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This change introduces a set of classes and properties enabling the
TileView to become a MVC component.

The change collapses the TileView and TileWithTextView classes into
one to avoid awkward naming. The TileView base class is never used as
a stand-alone component and MVC allows the class to control the
visibility of the TextView with ease.

The MVC component features all UI specific features used by TileView,
TileWithTextView, SuggestionsTileView and TopSitesTileView.

Bug: 1106109
Change-Id: I3dde36e767ae876759089bd3580ac5d9ac61e66e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424490
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809898}