Reviewed by Tony Gentilcore.

        IndexedDB: Support mutating cursors on top of LevelDB
        https://bugs.webkit.org/show_bug.cgi?id=61615

        New test for adding new entries to an objecet store while running a
        cursor over it.

        * storage/indexeddb/mutating-cursor-expected.txt: Added.
        * storage/indexeddb/mutating-cursor.html: Added.
2011-05-27  Hans Wennborg  <hans@chromium.org>

        Reviewed by Tony Gentilcore.

        IndexedDB: Support mutating cursors on top of LevelDB
        https://bugs.webkit.org/show_bug.cgi?id=61615

        We need to support the case where a new node is added to the tree in a
        transaction after the TreeIterator has covered the whole tree.

        Since this is done lazily, i.e. we set a flag that the tree might have
        changed, and act upon it later, some members need to be mutable,
        because we might need to re-seek the tree iterator in a const function.

        Test: storage/indexeddb/mutating-cursor.html
              storage/indexeddb/mozilla/cursor-mutation-objectstore-only.html (existing)

        * platform/leveldb/LevelDBTransaction.cpp:
        (WebCore::LevelDBTransaction::set):
        (WebCore::LevelDBTransaction::TreeIterator::reset):
        (WebCore::LevelDBTransaction::TreeIterator::~TreeIterator):
        (WebCore::LevelDBTransaction::TreeIterator::TreeIterator):
        (WebCore::LevelDBTransaction::TransactionIterator::TransactionIterator):
        (WebCore::LevelDBTransaction::TransactionIterator::~TransactionIterator):
        (WebCore::LevelDBTransaction::TransactionIterator::next):
        (WebCore::LevelDBTransaction::TransactionIterator::prev):
        (WebCore::LevelDBTransaction::TransactionIterator::key):
        (WebCore::LevelDBTransaction::TransactionIterator::value):
        (WebCore::LevelDBTransaction::TransactionIterator::treeChanged):
        (WebCore::LevelDBTransaction::TransactionIterator::refreshTreeIterator):
        (WebCore::LevelDBTransaction::registerIterator):
        (WebCore::LevelDBTransaction::unregisterIterator):
        (WebCore::LevelDBTransaction::notifyIteratorsOfTreeChange):
        * platform/leveldb/LevelDBTransaction.h:
        * storage/IDBFactoryBackendImpl.cpp:
        (WebCore::IDBFactoryBackendImpl::open):
        * storage/IDBLevelDBBackingStore.cpp:
        (WebCore::IDBLevelDBBackingStore::open):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@87508 268f45cc-cd09-0410-ab3c-d52691b4dbfc