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This patch adds a toggle to the Settings to enable/disable
notifications.

Bug: b/111505289
Test: VoiceInteractionControllerClientTest.PrefChangeSendsNotification
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I7b1ba03cc326abb098f9f902f0c51d68f4938133
Reviewed-on: https://chromium-review.googlesource.com/1142503
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579841}