LibWeb/Storage: Add a storage key getter that takes a URL::Origin

When we serialize blob URL entries we do not serialize the entire
environment settings object and only use it's origin. To allow
a Blob URL entry to access its relevant storage key, add a getter
that simply takes an origin.

Libraries/LibWeb/StorageAPI/StorageKey.cpp

@@ -26,6 +26,12 @@ Optional<StorageKey> obtain_a_storage_key(HTML::Environment const& environment)
     return key;
 }
 
+StorageKey obtain_a_storage_key_for_non_storage_purposes(URL::Origin const& origin)
+{
+    // NOTE: This function exists as there are cases where we don't have the full environment object, but we still need to obtain a storage key.
+    return { origin };
+}
+
 // https://storage.spec.whatwg.org/#obtain-a-storage-key-for-non-storage-purposes
 StorageKey obtain_a_storage_key_for_non_storage_purposes(HTML::Environment const& environment)
 {

Libraries/LibWeb/StorageAPI/StorageKey.h

@@ -30,6 +30,7 @@ struct StorageKey {
 };
 
 Optional<StorageKey> obtain_a_storage_key(HTML::Environment const&);
+StorageKey obtain_a_storage_key_for_non_storage_purposes(URL::Origin const&);
 StorageKey obtain_a_storage_key_for_non_storage_purposes(HTML::Environment const&);
 
 }