Upstream an assortment of IndexedDB tests to WPT.

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

Index: third_party/WebKit/LayoutTests/external/wpt/IndexedDB/support.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/IndexedDB/support.js b/third_party/WebKit/LayoutTests/external/wpt/IndexedDB/support.js
index 4bfaf72caa590ee11ed28ec16ef52db3248e4df2..f1c599c07b20c02df477c8c0b339db4a956c7bcc 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/IndexedDB/support.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/IndexedDB/support.js
@@ -128,3 +128,18 @@ function indexeddb_test(upgrade_func, open_func, description, options) {
     });
   }, 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();
+    }
+  };
+}