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

components/policy/core/common/configuration_policy_provider.cc

 // Copyright 2013 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 "components/policy/core/common/configuration_policy_provider.h"
 
 #include "base/callback.h"
 #include "components/policy/core/common/external_data_fetcher.h"
 #include "components/policy/core/common/policy_map.h"
 
@@ skipping 25 matching lines @@
   }
 }
 
 bool ConfigurationPolicyProvider::IsInitializationComplete(
     PolicyDomain domain) const {
   return true;
 }
 
 void ConfigurationPolicyProvider::UpdatePolicy(
     scoped_ptr<PolicyBundle> bundle) {
-  if (bundle.get())
+  if (bundle.get()) {
     policy_bundle_.Swap(bundle.get());
-  else
+    SetSources(source());

[Thiemo Nagel, 2015/09/01 17:40:37]

Not sure whether that makes any difference (can the policy be accessed
concurrently?) but it would seem more conservative to me to change the sources
first and swap second.

[fhorschig, 2015/09/04 06:53:54]

The poorly named function SetSources sets the sources of all entries in
policy_bundle_.
Therefore, setting the sources first would not work.

+  } else {
     policy_bundle_.Clear();
+  }
   FOR_EACH_OBSERVER(ConfigurationPolicyProvider::Observer,
                     observer_list_,
                     OnUpdatePolicy(this));
 }
 
+void ConfigurationPolicyProvider::SetSources(PolicySource source) {
+  for (PolicyBundle::iterator it = policy_bundle_.begin();
+       it != policy_bundle_.end(); ++it) {
+    it->second->SetSources(source);
+  }
+}
+
 SchemaRegistry* ConfigurationPolicyProvider::schema_registry() const {
   return schema_registry_;
 }
 
 const scoped_refptr<SchemaMap>&
 ConfigurationPolicyProvider::schema_map() const {
   return schema_registry_->schema_map();
 }
 
 void ConfigurationPolicyProvider::AddObserver(Observer* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void ConfigurationPolicyProvider::RemoveObserver(Observer* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 void ConfigurationPolicyProvider::OnSchemaRegistryUpdated(
     bool has_new_schemas) {}
 
 void ConfigurationPolicyProvider::OnSchemaRegistryReady() {}
 
 }  // namespace policy