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"
 
 namespace policy {
 
 ConfigurationPolicyProvider::Observer::~Observer() {}
 
 ConfigurationPolicyProvider::ConfigurationPolicyProvider()
-    : initialized_(false),
+    : source_(POLICY_SOURCE_UNKNOWN),
+      initialized_(false),
       schema_registry_(NULL) {}
 
 ConfigurationPolicyProvider::~ConfigurationPolicyProvider() {
   DCHECK(!initialized_);
 }
 
 void ConfigurationPolicyProvider::Init(SchemaRegistry* registry) {
   schema_registry_ = registry;
   schema_registry_->AddObserver(this);
   initialized_ = true;
 }
 
 void ConfigurationPolicyProvider::Shutdown() {
   initialized_ = false;
   if (schema_registry_) {
     // Unit tests don't initialize the BrowserPolicyConnector but call
     // shutdown; handle that.
     schema_registry_->RemoveObserver(this);
     schema_registry_ = NULL;
   }
 }
 
 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
+    SetPolicySources();
+  } else {
     policy_bundle_.Clear();
+  }
   FOR_EACH_OBSERVER(ConfigurationPolicyProvider::Observer,
                     observer_list_,
                     OnUpdatePolicy(this));
 }
 
+void ConfigurationPolicyProvider::SetPolicySources() {
+  for (auto& entry : policy_bundle_) {
+    entry.second->ApplySourceToEntries(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