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Extends ProactiveSuggestionsView as the implementation of the entry
point that is shown when the new "show-rich-entry-point" feature param
is enabled.

Note that this view hosts embedded web content and is currently
stubbed. Follow up CLs will:

- Replace hard-coded HTML w/ server provided HTML.
- Parameterize corner radius.
- Handle navigation attempts.

See bug for screenshots.

Bug: b:145056104
Change-Id: I17be0951e707317b4903b185043c41f17deebe5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1932463
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718878}