Integrate mojo localstorage implementation with DOMStorageContext API.

content/browser/dom_storage/local_storage_context_mojo.cc

Index: content/browser/dom_storage/local_storage_context_mojo.cc
diff --git a/content/browser/dom_storage/local_storage_context_mojo.cc b/content/browser/dom_storage/local_storage_context_mojo.cc
index c9939f57850985b7622018479a949b996de10ef6..01d0c82eef583922947de48d079a797e777246b3 100644
--- a/content/browser/dom_storage/local_storage_context_mojo.cc
+++ b/content/browser/dom_storage/local_storage_context_mojo.cc
@@ -97,6 +97,11 @@ void LocalStorageContextMojo::DeleteStorageForPhysicalOrigin(
       weak_ptr_factory_.GetWeakPtr(), origin));
 }
 
+void LocalStorageContextMojo::Flush() {
+  for (const auto& it : level_db_wrappers_)
+    it.second->ScheduleImmediateCommit();
+}
+
 void LocalStorageContextMojo::SetDatabaseForTesting(
     leveldb::mojom::LevelDBDatabasePtr database) {
   DCHECK_EQ(connection_state_, NO_CONNECTION);