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Use a token to represent answer card contents since SearchResult data
will go through mojo and views::View* will not work. When app list
search code is in the same process of its ui, AnswerCardCotnentsRegistry
works as a middle man to map token to underlying view. This CL covers
this part. When they are in two processes, the token is the embedding
token that could be used to embed answer card contents in app list ui.
This part will be implemented in a follow-up CL.

Bug: 812434
Change-Id: Ic15bb89c40e370bb3c5967f38efa58828be3967f
Reviewed-on: https://chromium-review.googlesource.com/957742Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543368}