WIP Durable storage, webkit side

Source/modules/quota/StorageQuota.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 81 matching lines @@
         resolver->reject(DOMError::create(NotSupportedError));
         return promise;
     }
 
     KURL storagePartition = KURL(KURL(), securityOrigin->toString());
     StorageQuotaCallbacks* callbacks = StorageQuotaCallbacksImpl::create(resolver);
     Platform::current()->queryStorageUsageAndQuota(storagePartition, stringToStorageQuotaType(type), callbacks);
     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());
     if (!client) {
         RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
         ScriptPromise promise = resolver->promise();
         resolver->reject(DOMError::create(NotSupportedError));
         return promise;
     }
 
     return client->requestPersistentQuota(scriptState, newQuota);
 }
 
 } // namespace blink