ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc

Index: chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
index a8088e314fe172e474895b7e19d59e85ea2cd95c..2f18b14e6b7d1b7dfaadab8bc5518c20bc257202 100644
--- a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
@@ -36,6 +36,7 @@
 #include "chrome/browser/chromeos/profiles/multiprofiles_session_aborted_dialog.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/session_length_limiter.h"
+#include "chrome/browser/chromeos/system/timezone_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/easy_unlock_service.h"
 #include "chrome/browser/supervised_user/chromeos/manager_password_service_factory.h"
@@ -378,6 +379,7 @@ void ChromeUserManagerImpl::Observe(
           sync_observer->StartObserving();
           multi_profile_user_controller_->StartObserving(profile);
         }
+        StartUserTimeZoneRefresh(profile);
       }
       break;
     }
@@ -1077,4 +1079,18 @@ void ChromeUserManagerImpl::UpdateNumberOfUsers() {
       base::StringPrintf("%" PRIuS, GetLoggedInUsers().size()));
 }
 
+void ChromeUserManagerImpl::StartUserTimeZoneRefresh(Profile* profile) {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kEnableTimeZoneTracking)) {
+    return;
+  }
+
+  if (profile->GetPrefs()->GetBoolean(prefs::kResolveTimezoneByGeolocation) &&
+      !system::HasSystemTimezonePolicy()) {
+    g_browser_process->platform_part()->timezone_resolver()->Start();
+  } else {
+    g_browser_process->platform_part()->timezone_resolver()->Stop();
+  }
+}
+
 }  // namespace chromeos