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This CL adds two classes for the suggestion and keyword views within an
OmniboxResultView. The intent is to move many of the members of
OmniboxResultView to one of the new classes. This CL doesn't move the
code yet. This Cl is boilerplate for the new classes. This is done to
better focus following CLs that will move code.

Bug: None
Change-Id: I0e9c766afef9c8cb13ff3b2a9b01a85c2041c51e
Reviewed-on: https://chromium-review.googlesource.com/980798
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547063}