ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/chromeos/login/ui/login_display_host_impl.cc

Index: chrome/browser/chromeos/login/ui/login_display_host_impl.cc
diff --git a/chrome/browser/chromeos/login/ui/login_display_host_impl.cc b/chrome/browser/chromeos/login/ui/login_display_host_impl.cc
index a7e6018b2adc80b7127c390e7bdde1d89c0b23c0..660c40e59c12ee9f51383135f63a6c9eccc8771c 100644
--- a/chrome/browser/chromeos/login/ui/login_display_host_impl.cc
+++ b/chrome/browser/chromeos/login/ui/login_display_host_impl.cc
@@ -44,6 +44,7 @@
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/browser/chromeos/policy/enrollment_config.h"
 #include "chrome/browser/chromeos/system/input_device_settings.h"
+#include "chrome/browser/chromeos/system/timezone_util.h"
 #include "chrome/browser/chromeos/ui/focus_ring_controller.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -1151,6 +1152,23 @@ void LoginDisplayHostImpl::OnLoginPromptVisible() {
   TryToPlayStartupSound();
 }
 
+void LoginDisplayHostImpl::StartTimeZoneResolve() {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kEnableTimeZoneTracking)) {
+    return;
+  }
+
+  if (!g_browser_process->local_state()->GetBoolean(
+          prefs::kResolveDeviceTimezoneByGeolocation)) {
+    return;
+  }
+
+  if (system::HasSystemTimezonePolicy())
+    return;
+
+  g_browser_process->platform_part()->timezone_resolver()->Start();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // external
 
@@ -1192,7 +1210,9 @@ void ShowLoginWizard(const std::string& first_screen_name) {
           ? session_manager::SESSION_STATE_LOGIN_PRIMARY
           : session_manager::SESSION_STATE_OOBE);
 
-  LoginDisplayHost* display_host = new LoginDisplayHostImpl(screen_bounds);
+  LoginDisplayHostImpl* display_host_impl =
+      new LoginDisplayHostImpl(screen_bounds);
+  LoginDisplayHost* display_host = display_host_impl;
 
   bool show_app_launch_splash_screen =
       (first_screen_name == WizardController::kAppLaunchSplashScreenName);
@@ -1222,6 +1242,8 @@ void ShowLoginWizard(const std::string& first_screen_name) {
         ServicesCustomizationDocument::GetInstance()
             ->EnsureCustomizationAppliedClosure(),
         base::TimeDelta::FromMilliseconds(kDefaultNetworkRetryDelayMS));
+
+    display_host_impl->StartTimeZoneResolve();
   }
 
   bool show_login_screen =