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

components/policy/core/common/policy_map.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/policy_map.h"
 
 #include <algorithm>
 
 #include "base/callback.h"
 #include "base/stl_util.h"
@@ skipping 10 matching lines @@
   delete value;
   value = NULL;
   delete external_data_fetcher;
   external_data_fetcher = NULL;
 }
 
 scoped_ptr<PolicyMap::Entry> PolicyMap::Entry::DeepCopy() const {
   scoped_ptr<Entry> copy(new Entry);
   copy->level = level;
   copy->scope = scope;
+  copy->source = source;
   if (value)
     copy->value = value->DeepCopy();
   if (external_data_fetcher) {
     copy->external_data_fetcher =
         new ExternalDataFetcher(*external_data_fetcher);
   }
   return copy.Pass();
 }
 
 bool PolicyMap::Entry::has_higher_priority_than(
     const PolicyMap::Entry& other) const {
   if (level == other.level)
     return scope > other.scope;
   else
     return level > other.level;
 }
 
 bool PolicyMap::Entry::Equals(const PolicyMap::Entry& other) const {
   return level == other.level &&
          scope == other.scope &&
+         source == other.source &&  // Necessary for PolicyUIHandler observers.
+                                    // They have to update when sources change.
          base::Value::Equals(value, other.value) &&
          ExternalDataFetcher::Equals(external_data_fetcher,
                                      other.external_data_fetcher);
 }
 
 PolicyMap::PolicyMap() {
 }
 
 PolicyMap::~PolicyMap() {
   Clear();
 }
 
 const PolicyMap::Entry* PolicyMap::Get(const std::string& policy) const {
   PolicyMapType::const_iterator entry = map_.find(policy);
   return entry == map_.end() ? NULL : &entry->second;
 }
 
 const base::Value* PolicyMap::GetValue(const std::string& policy) const {
   PolicyMapType::const_iterator entry = map_.find(policy);
   return entry == map_.end() ? NULL : entry->second.value;
 }
 
 void PolicyMap::Set(const std::string& policy,
                     PolicyLevel level,
                     PolicyScope scope,
+                    PolicySource source,
                     base::Value* value,
                     ExternalDataFetcher* external_data_fetcher) {
   Entry& entry = map_[policy];
   entry.DeleteOwnedMembers();
   entry.level = level;
   entry.scope = scope;
+  entry.source = source;
   entry.value = value;
   entry.external_data_fetcher = external_data_fetcher;
 }
 
 void PolicyMap::Erase(const std::string& policy) {
   PolicyMapType::iterator it = map_.find(policy);
   if (it != map_.end()) {
     it->second.DeleteOwnedMembers();
     map_.erase(it);
   }
 }
 
 void PolicyMap::Swap(PolicyMap* other) {
   map_.swap(other->map_);
 }
 
 void PolicyMap::CopyFrom(const PolicyMap& other) {
   Clear();
   for (const_iterator it = other.begin(); it != other.end(); ++it) {
     const Entry& entry = it->second;
-    Set(it->first, entry.level, entry.scope,
-        entry.value->DeepCopy(), entry.external_data_fetcher ?
-            new ExternalDataFetcher(*entry.external_data_fetcher) : NULL);
+    Set(it->first, entry.level, entry.scope, entry.source,
+        entry.value->DeepCopy(),
+        entry.external_data_fetcher
+            ? new ExternalDataFetcher(*entry.external_data_fetcher)
+            : nullptr);
   }
 }
 
 scoped_ptr<PolicyMap> PolicyMap::DeepCopy() const {
   PolicyMap* copy = new PolicyMap();
   copy->CopyFrom(*this);
   return make_scoped_ptr(copy);
 }
 
 void PolicyMap::MergeFrom(const PolicyMap& other) {
   for (const_iterator it = other.begin(); it != other.end(); ++it) {
     const Entry* entry = Get(it->first);
     if (!entry || it->second.has_higher_priority_than(*entry)) {
-      Set(it->first, it->second.level, it->second.scope,
-          it->second.value->DeepCopy(), it->second.external_data_fetcher ?
-              new ExternalDataFetcher(*it->second.external_data_fetcher) :
-              NULL);
+      Set(it->first, it->second.level, it->second.scope, it->second.source,
+          it->second.value->DeepCopy(),
+          it->second.external_data_fetcher
+              ? new ExternalDataFetcher(
+                    *it->second.external_data_fetcher)
+              : nullptr);
     }
   }
 }
 
 void PolicyMap::LoadFrom(
     const base::DictionaryValue* policies,
     PolicyLevel level,
-    PolicyScope scope) {
+    PolicyScope scope,
+    PolicySource source) {
   for (base::DictionaryValue::Iterator it(*policies);
        !it.IsAtEnd(); it.Advance()) {
-    Set(it.key(), level, scope, it.value().DeepCopy(), NULL);
+    Set(it.key(), level, scope, source, it.value().DeepCopy(), nullptr);
   }
 }
 
 void PolicyMap::GetDifferingKeys(const PolicyMap& other,
                                  std::set<std::string>* differing_keys) const {
   // Walk over the maps in lockstep, adding everything that is different.
   const_iterator iter_this(begin());
   const_iterator iter_other(other.begin());
   while (iter_this != end() && iter_other != other.end()) {
     const int diff = iter_this->first.compare(iter_other->first);
@@ skipping 57 matching lines @@
   map_.clear();
 }
 
 // static
 bool PolicyMap::MapEntryEquals(const PolicyMap::PolicyMapType::value_type& a,
                                const PolicyMap::PolicyMapType::value_type& b) {
   return a.first == b.first && a.second.Equals(b.second);
 }
 
 }  // namespace policy