Add a mojo bridge for PersistentPrefStore.

chrome/browser/prefs/profile_pref_store_manager.cc

Index: chrome/browser/prefs/profile_pref_store_manager.cc
diff --git a/chrome/browser/prefs/profile_pref_store_manager.cc b/chrome/browser/prefs/profile_pref_store_manager.cc
index 98f85db941adbc593d951c97aaad3117be85cc6a..a7834f1dcb79013d9fd9feeb0dbedbc5b15643c5 100644
--- a/chrome/browser/prefs/profile_pref_store_manager.cc
+++ b/chrome/browser/prefs/profile_pref_store_manager.cc
@@ -16,6 +16,7 @@
 #include "base/sequenced_task_runner.h"
 #include "build/build_config.h"
 #include "chrome/common/chrome_constants.h"
+#include "chrome/common/chrome_features.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/json_pref_store.h"
 #include "components/prefs/persistent_pref_store.h"
@@ -23,6 +24,8 @@
 #include "components/user_prefs/tracked/pref_hash_store_impl.h"
 #include "components/user_prefs/tracked/segregated_pref_store.h"
 #include "components/user_prefs/tracked/tracked_preferences_migration.h"
+#include "services/preferences/public/cpp/persistent_pref_store_mojo.h"
+#include "services/preferences/public/cpp/user_prefs_impl.h"
 
 #if defined(OS_WIN)
 #include "chrome/installer/util/browser_distribution.h"
@@ -100,10 +103,34 @@ void ProfilePrefStoreManager::SetPreferenceValidationRegistryPathForTesting(
 #endif  // OS_WIN
 
 PersistentPrefStore* ProfilePrefStoreManager::CreateProfilePrefStore(
+    const scoped_refptr<base::SingleThreadTaskRunner>& pref_task_runner,
     const scoped_refptr<base::SequencedTaskRunner>& io_task_runner,
     const base::Closure& on_reset_on_load,
-    TrackedPreferenceValidationDelegate* validation_delegate) {
-  std::unique_ptr<PrefFilter> pref_filter;
+    base::WeakPtr<TrackedPreferenceValidationDelegate> validation_delegate) {
+  prefs::mojom::PersistentPrefStoreConnectorPtr connector;
+  if (base::FeatureList::IsEnabled(features::kPrefService)) {
+    if (!kPlatformSupportsPreferenceTracking) {
+      prefs::CreateUserPrefs(profile_path_.Append(chrome::kPreferencesFilename),
+                             pref_task_runner, io_task_runner,
+                             mojo::MakeRequest(&connector));
+    } else {
+      prefs::CreateSegregatedUserPrefs(
+          profile_path_.Append(chrome::kPreferencesFilename),
+          profile_path_.Append(chrome::kSecurePreferencesFilename),
+          tracking_configuration_, reporting_ids_count_, seed_,
+          legacy_device_id_,
+#if defined(OS_WIN)
+          g_preference_validation_registry_path_for_testing
+              ? *g_preference_validation_registry_path_for_testing
+              : BrowserDistribution::GetDistribution()->GetRegistryPath(),
+#else
+          base::string16(),
+#endif
+          validation_delegate, on_reset_on_load, pref_task_runner,
+          io_task_runner, mojo::MakeRequest(&connector));
+    }
+    return new prefs::PersistentPrefStoreMojo(std::move(connector));
+  }
   if (!kPlatformSupportsPreferenceTracking) {
     return new JsonPrefStore(profile_path_.Append(chrome::kPreferencesFilename),
                              io_task_runner.get(),
@@ -130,13 +157,13 @@ PersistentPrefStore* ProfilePrefStoreManager::CreateProfilePrefStore(
   }
 
   std::unique_ptr<PrefHashFilter> unprotected_pref_hash_filter(
-      new PrefHashFilter(GetPrefHashStore(false),
-                         GetExternalVerificationPrefHashStorePair(),
-                         unprotected_configuration, base::Closure(),
-                         validation_delegate, reporting_ids_count_, false));
+      new PrefHashFilter(
+          GetPrefHashStore(false), GetExternalVerificationPrefHashStorePair(),
+          unprotected_configuration, base::Closure(), validation_delegate.get(),
+          reporting_ids_count_, false));
   std::unique_ptr<PrefHashFilter> protected_pref_hash_filter(new PrefHashFilter(
       GetPrefHashStore(true), GetExternalVerificationPrefHashStorePair(),
-      protected_configuration, on_reset_on_load, validation_delegate,
+      protected_configuration, on_reset_on_load, validation_delegate.get(),
       reporting_ids_count_, true));
 
   PrefHashFilter* raw_unprotected_pref_hash_filter =