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 0c2dae820002b83dc3a926c6dc7de4e08f44a4ea..7d53d262f278444e39dcfcf5098e929a4c918aa0 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -364,6 +364,10 @@ 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);
 }