Use a two-part data format version in IndexedDB metadata.

content/common/indexed_db/indexed_db_struct_traits.cc

Index: content/common/indexed_db/indexed_db_struct_traits.cc
diff --git a/content/common/indexed_db/indexed_db_struct_traits.cc b/content/common/indexed_db/indexed_db_struct_traits.cc
index 85d5fe602f7b5def4eb972a15454a2c14e6ad8ee..89646ab376dc800c345c81a512441f242d3aa053 100644
--- a/content/common/indexed_db/indexed_db_struct_traits.cc
+++ b/content/common/indexed_db/indexed_db_struct_traits.cc
@@ -246,6 +246,16 @@ bool StructTraits<indexed_db::mojom::DatabaseMetadataDataView,
 }
 
 // static
+bool StructTraits<indexed_db::mojom::DataFormatVersionDataView,
+                  content::IndexedDBDataFormatVersion>::
+    Read(indexed_db::mojom::DataFormatVersionDataView data,
+         content::IndexedDBDataFormatVersion* out) {
+  *out = content::IndexedDBDataFormatVersion(data.v8_version(),
+                                             data.blink_version());
+  return true;
+}
+
+// static
 CursorDirection
 EnumTraits<CursorDirection, blink::WebIDBCursorDirection>::ToMojom(
     blink::WebIDBCursorDirection input) {