Add user activity event type for accessibility.

    USER_ACTIVITY_EVENT_OTHER = 0,

    USER_ACTIVITY_EVENT_BUTTON = 1,

    USER_ACTIVITY_EVENT_TOUCH = 2,

    USER_ACTIVITY_EVENT_ACCESSIBILITY = 3,

    USER_ACTIVITY_EVENT_LAST = USER_ACTIVITY_EVENT_TOUCH, // Last valid event code.

    USER_ACTIVITY_EVENT_LAST = USER_ACTIVITY_EVENT_ACCESSIBILITY, // Last valid event code.

};

}; // namespace android