Register a pref to control migration status

components/content_settings/core/browser/host_content_settings_map.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/content_settings/core/browser/host_content_settings_map.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 151 matching lines @@
   // the guest profile and so we need to ensure those get cleared.
   if (is_guest_profile)
     pref_provider_->ClearPrefs();
 
   content_settings::ObservableProvider* default_provider =
       new content_settings::DefaultProvider(prefs_, is_off_the_record_);
   default_provider->AddObserver(this);
   content_settings_providers_[DEFAULT_PROVIDER] = default_provider;
 
   MigrateKeygenSettings();
-  MigrateDomainScopedSettings();
+
+  if (prefs_->GetInteger(prefs::kContentSettingsMigrationStatus) ==
+      content_settings::NOT_MIGRATED) {
+    MigrateDomainScopedSettings();
+    prefs_->SetInteger(prefs::kContentSettingsMigrationStatus,
+                       content_settings::DONE_IN_HCSM);
+  }
+
   RecordNumberOfExceptions();
 }
 
 // static
 void HostContentSettingsMap::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   // Ensure the content settings are all registered.
   content_settings::ContentSettingsRegistry::GetInstance();
 
   registry->RegisterIntegerPref(prefs::kContentSettingsWindowLastTabIndex, 0);
+  registry->RegisterIntegerPref(prefs::kContentSettingsMigrationStatus,
+                                content_settings::NOT_MIGRATED);
 
   // Register the prefs for the content settings providers.
   content_settings::DefaultProvider::RegisterProfilePrefs(registry);
   content_settings::PrefProvider::RegisterProfilePrefs(registry);
   content_settings::PolicyProvider::RegisterProfilePrefs(registry);
 }
 
 void HostContentSettingsMap::RegisterProvider(
     ProviderType type,
     std::unique_ptr<content_settings::ObservableProvider> provider) {
@@ skipping 721 matching lines @@
         *secondary_pattern = rule.secondary_pattern;
       return base::WrapUnique(rule.value.get()->DeepCopy());
     }
   }
   return std::unique_ptr<base::Value>();
 }
 
 base::WeakPtr<HostContentSettingsMap> HostContentSettingsMap::GetWeakPtr() {
   return weak_ptr_factory_.GetWeakPtr();
 }