ChromeOS: Add SystemTimezoneAutomaticDetection policy.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index 26f520a509d91eb607b817baafc73c5f554f274c..f59a90d36ad62ed18757d4d00fbb59838429e1af 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -359,6 +359,10 @@ const char kCrosRegion[] = "cros-region";
 const char kTestCrosGaiaIdMigration[] = "test-cros-gaia-id-migration";
 const char kTestCrosGaiaIdMigrationStarted[] = "started";
 
+// This flag enables SystemTimezoneAutomaticDetection policy.
+const char kEnableSystemTimezoneAutomaticDetectionPolicy[] =
+    "enable-system-timezone-automatic-detection";
+
 bool WakeOnWifiEnabled() {
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(kDisableWakeOnWifi);
 }