Fire window.onerror for uncaught IndexedDB errors

LayoutTests/storage/indexeddb/resources/transaction-error.js

 if (this.importScripts) {
     importScripts('../../../resources/js-test.js');
     importScripts('shared.js');
 }
 
 description("Test IDBTransaction.error cases.");
 
 indexedDBTest(prepareDatabase, startTest);
 function prepareDatabase()
 {
@@ skipping 28 matching lines @@
 }
 
 function testErrorFromRequest()
 {
     debug("");
     debug("If the transaction is aborted due to a request error that is not prevented, IDBTransaction.error should match:");
     evalAndLog("trans = db.transaction('storeName', 'readwrite')");
     evalAndLog("request = trans.objectStore('storeName').add('value2', 'key')");
     request.onsuccess = unexpectedSuccessCallback;
     request.onerror = function() {
+        expectError();
         shouldBe("request.error.name", "'ConstraintError'");
         evalAndLog("request_error = request.error");
     };
     trans.oncomplete = unexpectedCompleteCallback;
     trans.onabort = function() {
         debug("Transaction received abort event.");
         shouldBeNonNull("trans.error");
         debug("trans.error.message = " + trans.error.message);
         shouldBeNonNull("trans.error.message");
         shouldBe("trans.error", "request_error");
@@ skipping 61 matching lines @@
                 debug("trans.error.message = " + trans.error.message);
                 shouldBeNonNull("trans.error.message");
                 debug("Note: This fails because of http://wkb.ug/37327");
                 shouldNotBe("trans.error.message.indexOf(indexName)", "-1");
                 debug("");
                 finishJSTest();
             };
         };
     };
 }