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Add a test-fixture and basic tests for QuickAnswersView. Current tests
verify the view's positioning with respect to its anchor and more tests
will be added in follow-up CLs.

Bug: b:157182213
Test: Built and ran ash:ash_unittests on local build.
Change-Id: I44634313ff6538e48ef7375641e1971bfc989ab1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210977Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Abhijeet Singh <siabhijeet@google.com>
Cr-Commit-Position: refs/heads/master@{#771207}