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Do not allow system gestures when dreaming.
Currently, TaskBar expansion is allowed when an activity context is available. Since Dreams are implemented as an activity, this leads to being able to expand the TaskBar over a dream. This changelist updates the logic to not allow system gestures when dreaming. Test: manual Bug: 265755700 Change-Id: If58608c1e491da7906a2615681da0514fa49cfc8