Pref service: Batch pref updates.

services/preferences/public/cpp/pref_store_client_mixin.cc

Index: services/preferences/public/cpp/pref_store_client_mixin.cc
diff --git a/services/preferences/public/cpp/pref_store_client_mixin.cc b/services/preferences/public/cpp/pref_store_client_mixin.cc
index a82108a1d41fce48b601928cdee6a61369baa24b..0387883265f206a0a0e34b1c0f981b34f923f239 100644
--- a/services/preferences/public/cpp/pref_store_client_mixin.cc
+++ b/services/preferences/public/cpp/pref_store_client_mixin.cc
@@ -82,6 +82,23 @@ void PrefStoreClientMixin<BasePrefStore>::ReportPrefValueChanged(
 }
 
 template <typename BasePrefStore>
+void PrefStoreClientMixin<BasePrefStore>::OnPrefsChanged(
+    std::vector<mojom::PrefUpdatePtr> updates) {
+  for (const auto& update : updates)
+    OnPrefChanged(update->key, std::move(update->value));
+}
+
+template <typename BasePrefStore>
+void PrefStoreClientMixin<BasePrefStore>::OnInitializationCompleted(
+    bool succeeded) {
+  if (!initialized_) {
+    initialized_ = true;
+    for (auto& observer : observers_)
+      observer.OnInitializationCompleted(succeeded);
+  }
+}
+
+template <typename BasePrefStore>
 void PrefStoreClientMixin<BasePrefStore>::OnPrefChanged(
     const std::string& key,
     std::unique_ptr<base::Value> value) {
@@ -106,16 +123,6 @@ void PrefStoreClientMixin<BasePrefStore>::OnPrefChanged(
     ReportPrefValueChanged(key);
 }
 
-template <typename BasePrefStore>
-void PrefStoreClientMixin<BasePrefStore>::OnInitializationCompleted(
-    bool succeeded) {
-  if (!initialized_) {
-    initialized_ = true;
-    for (auto& observer : observers_)
-      observer.OnInitializationCompleted(succeeded);
-  }
-}
-
 template class PrefStoreClientMixin<::PrefStore>;
 template class PrefStoreClientMixin<::PersistentPrefStore>;