Send IndexedDB observations through IDBDatabaseCallbacks.

content/common/indexed_db/indexed_db_enum_traits.h

Index: content/common/indexed_db/indexed_db_enum_traits.h
diff --git a/content/common/indexed_db/indexed_db_enum_traits.h b/content/common/indexed_db/indexed_db_enum_traits.h
index 9677a3870b1b754c7932b5a6e68acbe64a6cdf8b..d367b3248663ab1c6b44fa6901156f3e29f8c7cd 100644
--- a/content/common/indexed_db/indexed_db_enum_traits.h
+++ b/content/common/indexed_db/indexed_db_enum_traits.h
@@ -27,6 +27,15 @@ struct EnumTraits<indexed_db::mojom::DataLoss, blink::WebIDBDataLoss> {
 };
 
 template <>
+struct EnumTraits<indexed_db::mojom::OperationType,
+                  blink::WebIDBOperationType> {
+  static indexed_db::mojom::OperationType ToMojom(
+      blink::WebIDBOperationType input);
+  static bool FromMojom(indexed_db::mojom::OperationType input,
+                        blink::WebIDBOperationType* output);
+};
+
+template <>
 struct EnumTraits<indexed_db::mojom::PutMode, blink::WebIDBPutMode> {
   static indexed_db::mojom::PutMode ToMojom(blink::WebIDBPutMode input);
   static bool FromMojom(indexed_db::mojom::PutMode input,