Chrome Version: (copy from chrome://version)
Chrome built from head.

OS: (e.g. Win10, MacOS 10.12, etc...)
Android.

What steps will reproduce the problem?
(1) Build (with is_debug=true) and install Chrome app from head.
(2) Travel to place with different time zone (or set it manually).
(3) Re-open app

What is the expected result?
App crashed.

What happens instead?
App not crash.


Please use labels and text to provide additional information.

Error messages:
06-20 16:06:07.262 3423-3423/com.google.android.apps.chrome A/chromium: [FATAL:offline_metrics_collector_impl.cc(244)] Check failed: days_in_between >= 0. 
    #00 0xd34d9985 /data/app/com.google.android.apps.chrome-82HULYE7ey3rZYGN-NUThg==/lib/arm/libbase.cr.so+0x000d2985
    #01 0xc89eca8d /data/app/com.google.android.apps.chrome-82HULYE7ey3rZYGN-NUThg==/lib/arm/libchrome.cr.so+0x0071da8d
06-20 16:06:07.262 3423-3423/com.google.android.apps.chrome A/libc: Fatal signal 6 (SIGABRT), code -6 in tid 3423 (oid.apps.chrome), pid 3423 (oid.apps.chrome)

I checked the code (https://cs.chromium.org/chromium/src/chrome/browser/offline_pages/prefetch/offline_metrics_collector_impl.cc?q=offline_metrics_collector_impl.cc&sq=package:chromium&dr):

Line 207 checks 'tracking_day_midnight_' must be less than 'current_midnight', but it could not make sure that the DCHECK in line 242 is always safe, in case of timezone changed, value of 'tracking_day_midnight_' may not be aligned to the midnight of new timezone any more, so it is possible than 
          tracking_day_midnight_ < current_midnight
but       (current_midnight - tracking_day_midnight_).InDays() == 0
in case   current_midnight - tracking_day_midnight_ < [one whole day]

In this case, DCHECK in line 242 failed and crashed the app.

I tried to fix this issue by set 'tracking_day_midnight_' to midnight at beginning of function 'UpdatePastDaysIfNeeded', but seems it may change the metrics as well, not sure it is the right way to do.

Thanks!