[Policy Experimental] Add "recommended" policies for URL exceptions.

components/prefs/pref_service.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 "components/prefs/pref_service.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 520 matching lines @@
 base::Value::Type PrefService::Preference::GetType() const {
   return type_;
 }
 
 const base::Value* PrefService::Preference::GetValue() const {
   const base::Value* result= pref_service_->GetPreferenceValue(name_);
   DCHECK(result) << "Must register pref before getting its value";
   return result;
 }
 
+const base::Value* PrefService::Preference::GetManagedValue() const {
+  DCHECK(pref_service_->FindPreference(name_))
+      << "Must register pref before getting its value";
+
+  const base::Value* found_value = nullptr;
+  if (pref_value_store()->GetManagedValue(name_, type_, &found_value)) {
+    DCHECK(found_value->IsType(type_));
+    return found_value;
+  }
+
+  // The pref has no managed value.
+  return nullptr;
+}
+
 const base::Value* PrefService::Preference::GetRecommendedValue() const {
   DCHECK(pref_service_->FindPreference(name_))
       << "Must register pref before getting its value";
 
-  const base::Value* found_value = NULL;
+  const base::Value* found_value = nullptr;
   if (pref_value_store()->GetRecommendedValue(name_, type_, &found_value)) {
     DCHECK(found_value->IsType(type_));
     return found_value;
   }
 
   // The pref has no recommended value.
-  return NULL;
+  return nullptr;
 }
 
 bool PrefService::Preference::IsManaged() const {
   return pref_value_store()->PrefValueInManagedStore(name_);
 }
 
 bool PrefService::Preference::IsManagedByCustodian() const {
   return pref_value_store()->PrefValueInSupervisedStore(name_.c_str());
 }
 
@@ skipping 48 matching lines @@
       DCHECK(found_value->IsType(default_type));
       return found_value;
     } else {
       // Every registered preference has at least a default value.
       NOTREACHED() << "no valid value found for registered pref " << path;
     }
   }
 
   return NULL;
 }