IndexedDB: IDBDatabase should have a close pending field.

IndexedDB: IDBDatabase should have a close pending field.
https://bugs.webkit.org/show_bug.cgi?id=71129

Reviewed by Tony Chang.

Source/WebCore:

Handle the IDB spec case that "versionchange" events should not be fired
against connections that have the internal "closePending" flag set but
are not yet closed due to running transactions.

Test: storage/indexeddb/database-closepending-flag.html

* Modules/indexeddb/IDBDatabase.cpp:
(WebCore::IDBDatabase::onVersionChange):

LayoutTests:

* storage/indexeddb/database-closepending-flag-expected.txt: Added.
* storage/indexeddb/database-closepending-flag.html: Added.
* storage/indexeddb/resources/database-closepending-flag.js: Added.
(test):
(openConnection.request.onsuccess.request.onsuccess):
(openConnection.request.onsuccess):
(openConnection):
(testIDBDatabaseName):
(testIDBDatabaseObjectStoreNames.request.onsuccess.request.onsuccess.transaction.oncomplete):
(testIDBDatabaseObjectStoreNames.request.onsuccess.request.onsuccess):
(testIDBDatabaseObjectStoreNames.request.onsuccess):
(testIDBDatabaseObjectStoreNames):
(testIDBDatabaseTransaction):
(testVersionChangeTransactionSteps.request.onsuccess.request.onsuccess.request.onblocked):
(testVersionChangeTransactionSteps.request.onsuccess.request.onsuccess.request.onsuccess.transaction.oncomplete):
(testVersionChangeTransactionSteps.request.onsuccess.request.onsuccess.request.onsuccess):
(testVersionChangeTransactionSteps.request.onsuccess.request.onsuccess):
(testDatabaseDeletion.request.onsuccess.request.onblocked):
(testDatabaseDeletion.request.onsuccess.request.onsuccess):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121488 268f45cc-cd09-0410-ab3c-d52691b4dbfc