Import Mozilla's IDBObjectStore.openKeyCursor() test

LayoutTests/storage/indexeddb/mozilla/resources/getAll_test_adapter.js

-'use strict';
-
-// Adapter for Mozilla's getAll tests to Blink's js-test.
-
-var jsTestIsAsync = true;
-
-// Moz tests are still prefixed
-IDBObjectStore.prototype.mozGetAll = IDBObjectStore.prototype.getAll;
-IDBObjectStore.prototype.mozGetAllKeys = IDBObjectStore.prototype.getAllKeys;
-IDBIndex.prototype.mozGetAll = IDBIndex.prototype.getAll;
-IDBIndex.prototype.mozGetAllKeys = IDBIndex.prototype.getAllKeys;
-
-function errorHandler(e) {
-    testFailed("Unexpected error: " + e.type + " - " + e.message);
-    finishJSTest();
-}
-function ok(t, message) {
-    if (!t) {
-        testFailed(message);
-        finishJSTest();
-    } else {
-        testPassed(message);
-    }
-}
-function is(a, b, message) {
-    ok(Object.is(a, b), message);
-}
-function grabEventAndContinueHandler(e) {
-    testGenerator.next(e);
-}
-function executeSoon(f) {
-    setTimeout(f, 0);
-}
-function finishTest() {
-    finishJSTest();
-}
-function unexpectedSuccessHandler(e) {
-    ok(false, "Unexpected success");
-}
-function info(message) {
-    debug(message);
-}
-testGenerator.next();