Fire window.onerror for uncaught IndexedDB errors

Source/modules/indexeddb/IDBRequest.h

Index: Source/modules/indexeddb/IDBRequest.h
diff --git a/Source/modules/indexeddb/IDBRequest.h b/Source/modules/indexeddb/IDBRequest.h
index 6c5e1eece54f06caa237689fabc69d574c876ad5..c8621ad9ad45483d1e6cce7cb948c1ebcd6c396f 100644
--- a/Source/modules/indexeddb/IDBRequest.h
+++ b/Source/modules/indexeddb/IDBRequest.h
@@ -53,6 +53,7 @@ class ExceptionState;
 class IDBCursor;
 struct IDBDatabaseMetadata;
 class IDBValue;
+class ScriptCallStack;
 
 class MODULES_EXPORT IDBRequest
     : public RefCountedGarbageCollectedEventTargetWithInlineData<IDBRequest>
@@ -140,6 +141,7 @@ protected:
     Member<IDBTransaction> m_transaction;
     ReadyState m_readyState = PENDING;
     bool m_requestAborted = false; // May be aborted by transaction then receive async onsuccess; ignore vs. assert.
+    RefPtrWillBeMember<ScriptCallStack> m_creationStack;
 
 private:
     void setResultCursor(IDBCursor*, IDBKey*, IDBKey* primaryKey, PassRefPtr<IDBValue>);