100644 blob c45121d2c9e9ec449f82f678e23b082b1a44fe4d	user_activity_detector.cc
100644 blob 0f2a9a9ec4b58ce555334c68113b56b062a3cf87	user_activity_detector.h
100644 blob 82b26d238a5439f0bdbc919b92624d6032a75e18	user_activity_detector_unittest.cc
100644 blob f6b98d210afdabb8ca580b7d094dbc68700bd24e	user_activity_observer.h