https://listnr.corp.google.com/product/208/report/85854801016

There seems to be a 3-hour discrepancy depending on the log.  More specifically:

There is this on the report page.  I assume that's when the report arrived at the server.

Submitted on: December 18, 2018 15:26:51 (PST)

Then in the system logs, near the top, there is this entry:

LOGDATE=Tue Dec 18 10:24:36 PST 2018

Is that the beginning of log collection?  That seems possible.  The chrome_user_log ends here, which is consistent at about 10:25am:

[1624:1624:1218/102557.736722:WARNING:

However, the kernel log and vmlog end three hours later:

[1218/132503] 5554 0 0 5350 20023 1.00 1499941 1499941

2018-12-18T13:24:57.414594-05:00 WARNING mosys[30577]: libminijail[30577]: SECURE_NOROOT not set, not dropping bounding set

Other end times:

tlsdate:
2018-12-18T10:46:51.009023-05:00 INFO tlsdated[2506]: [event:handle_time_setter] time set from the network (1545148011)
(this could be sparsely populated in time)

top:
top - 10:25:01 up 13 days, 13:56,  0 users,  load average: 16.29, 5.67, 3.74

update_manager:
[1218/132422:ERROR:real_shill_provider.cc(128)] Could not find connection type (service: /service/1714)

chrome_system_log:

[1826:1848:1218/132421.046591:VERBOSE1:drm_display.cc(104)] DRM configuring: device=/sys/devices/pci0000:00/0000:00:02.0/drm/card0 crtc=35 connector=57 origin=0,0 size=1920x1200