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This cl adds a new policy, which controls the visilibity of the
FloatingAccessibilityView via FloatingAccessibilityController.

Bug: 1061068
Change-Id: Ie0b5cbe18f714cc6b848fb8f71b92bc120a2f19a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134826
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Anqing Zhao <anqing@google.com>
Cr-Commit-Position: refs/heads/master@{#758815}