Add enterprise policy for network time service

components/network_time/network_time_pref_names.cc

Index: components/network_time/network_time_pref_names.cc
diff --git a/components/network_time/network_time_pref_names.cc b/components/network_time/network_time_pref_names.cc
index a1160e232efd00c2331db77a484d01ec5bbc14d9..14e20471186486212a9d3e38ae9ecf887f446906 100644
--- a/components/network_time/network_time_pref_names.cc
+++ b/components/network_time/network_time_pref_names.cc
@@ -11,5 +11,9 @@ namespace prefs {
 // network time tracker when browser starts.
 const char kNetworkTimeMapping[] = "network_time.network_time_mapping";
 
+// Stores a boolean indicating whether network time queries should be enabled.
+const char kNetworkTimeQueriesEnabled[] =
+    "network_time.network_time_queries_enabled";
+
 }  // namespace prefs
 }  // namespace network_time