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This CL makes quick_answers::UserConsentView share logic with
QuickAnswersView via a common pre-target handler. This change also
proposes handling context-menu, Quick Answers views are companion-views
of which, in a more robust way by dismissing it whenever these views are
closed.

Corner-case scenario where the menu should not be dismissed (for
example, QuickAnswersView should be displayed after acknowledging and
dismissing UserConsentView) is handled by the pre-target handler providing
a setter.

Bug: b:151111996
Test: Tested on Atlas test device.
Change-Id: I94fc256ca329787188315df8e71457e4530f4281
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2195338Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Abhijeet Singh <siabhijeet@google.com>
Cr-Commit-Position: refs/heads/master@{#768505}