Add source column to chrome://policy showing the origins of policies.

chrome/browser/chromeos/policy/configuration_policy_handler_chromeos.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/policy/configuration_policy_handler_chromeos.h"
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 248 matching lines @@
 void NetworkConfigurationPolicyHandler::PrepareForDisplaying(
     PolicyMap* policies) const {
   const PolicyMap::Entry* entry = policies->Get(policy_name());
   if (!entry)
     return;
   base::Value* sanitized_config = SanitizeNetworkConfig(entry->value);
   if (!sanitized_config)
     sanitized_config = base::Value::CreateNullValue().release();
 
   policies->Set(policy_name(), entry->level, entry->scope,
-                sanitized_config, NULL);
+                entry->source, sanitized_config, nullptr);
 }
 
 NetworkConfigurationPolicyHandler::NetworkConfigurationPolicyHandler(
     const char* policy_name,
     onc::ONCSource onc_source,
     const char* pref_path)
     : TypeCheckingPolicyHandler(policy_name, base::Value::TYPE_STRING),
       onc_source_(onc_source),
       pref_path_(pref_path) {
 }
@@ skipping 192 matching lines @@
 
   value = GetValue(dict, kScreenLockDelayAC);
   if (value)
     prefs->SetValue(prefs::kPowerAcScreenLockDelayMs, value.Pass());
   value = GetValue(dict, kScreenLockDelayBattery);
   if (value)
     prefs->SetValue(prefs::kPowerBatteryScreenLockDelayMs, value.Pass());
 }
 
 }  // namespace policy