WIP Durable storage, webkit side

Source/modules/quota/StorageQuota.cpp

Index: Source/modules/quota/StorageQuota.cpp
diff --git a/Source/modules/quota/StorageQuota.cpp b/Source/modules/quota/StorageQuota.cpp
index 7c98ac84b65119b10483d08ae4fdeaa2fd11cf38..2907adf684c02dc62bb6af53ae1eefb576d15c92 100644
--- a/Source/modules/quota/StorageQuota.cpp
+++ b/Source/modules/quota/StorageQuota.cpp
@@ -99,6 +99,19 @@ ScriptPromise StorageQuota::queryInfo(ScriptState* scriptState, String type)
     return promise;
 }
 
+ScriptPromise StorageQuota::requestDurability(ScriptState* scriptState)
+{
+    StorageQuotaClient* client = StorageQuotaClient::from(scriptState->executionContext());
+    if (!client) {
+        RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+        ScriptPromise promise = resolver->promise();
+        resolver->reject(DOMError::create(NotSupportedError));
+        return promise;
+    }
+
+    return client->requestDurability(scriptState);
+}
+
 ScriptPromise StorageQuota::requestPersistentQuota(ScriptState* scriptState, unsigned long long newQuota)
 {
     StorageQuotaClient* client = StorageQuotaClient::from(scriptState->executionContext());