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This enables developing the dialog and related functionalities without
having to worry too much about the view itself.

Bug: b:156258540
Change-Id: If0dd36671742d9f2b3c576ef3d4f3a52577356ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298586
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791347}