100644 blob bfda1cfdc91a96587501abf2cd021daaa48b3b24	user_activity_detector.cc
100644 blob f2f68897175bac509db84993e54c19348188e66e	user_activity_detector.h
100644 blob 5bcc7a9000ad794f5da09feb52afc53b4282aa60	user_activity_detector_unittest.cc
100644 blob f6b98d210afdabb8ca580b7d094dbc68700bd24e	user_activity_observer.h