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This patch adds unit tests for emebedded Assistant UI to test the basic
UI visibility and app list states.

Bug: 924624
Test: AppListView*Test:*EmbeddedAssistantUI*
Change-Id: I588ffb174d5f4e6ec2a1e0c80d139648740a01fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1501514
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638422}