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The flag needs to be synced since hotword does
not go through any entrance point in
ArcVoiceInteractionFrameworkService. For this
case we can only guard context but not the
invocation of voice interaction session.

BUG=b:65963302
TEST=Manual test

Change-Id: I2cddd95b8018e18d79991602834451ebbe28e698
Reviewed-on: https://chromium-review.googlesource.com/676344
Commit-Queue: Muyuan Li <muyuanli@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504886}