Upstream an assortment of IndexedDB tests to WPT.

third_party/WebKit/LayoutTests/external/wpt/IndexedDB/support.js

 var databaseName = "database";
 var databaseVersion = 1;
 
 /* Delete created databases
  *
  * Go through each finished test, see if it has an associated database. Close
  * that and delete the database. */
 add_completion_callback(function(tests)
 {
     for (var i in tests)
@@ skipping 110 matching lines @@
       var tx = open.transaction;
       upgrade_func(t, db, tx);
     });
     open.onsuccess = t.step_func(function() {
       var db = open.result;
       if (open_func)
         open_func(t, db);
     });
   }, description);
 }
+
+// Call with a Test and an array of expected results in order. Returns
+// a function; call the function when a result arrives and when the
+// expected number appear the order will be asserted and test
+// completed.
+function expect(t, expected) {
+  var results = [];
+  return result => {
+    results.push(result);
+    if (results.length === expected.length) {
+      assert_array_equals(results, expected);
+      t.done();
+    }
+  };
+}