Add additional usage metrics for DOMStringList methods

Source/modules/indexeddb/IDBDatabase.cpp

Index: Source/modules/indexeddb/IDBDatabase.cpp
diff --git a/Source/modules/indexeddb/IDBDatabase.cpp b/Source/modules/indexeddb/IDBDatabase.cpp
index d365d959afae1069d25fc9ad5a2c98841e6b0420..5448d2be5d2ea35cee94bb3ba1546e3530f67314 100644
--- a/Source/modules/indexeddb/IDBDatabase.cpp
+++ b/Source/modules/indexeddb/IDBDatabase.cpp
@@ -168,7 +168,7 @@ void IDBDatabase::onComplete(int64_t transactionId)
 
 PassRefPtrWillBeRawPtr<DOMStringList> IDBDatabase::objectStoreNames() const
 {
-    RefPtrWillBeRawPtr<DOMStringList> objectStoreNames = DOMStringList::create();
+    RefPtrWillBeRawPtr<DOMStringList> objectStoreNames = DOMStringList::create(DOMStringList::IndexedDB);
     for (IDBDatabaseMetadata::ObjectStoreMap::const_iterator it = m_metadata.objectStores.begin(); it != m_metadata.objectStores.end(); ++it)
         objectStoreNames->append(it->value.name);
     objectStoreNames->sort();