Merge 96007 - IndexedDB: Null key path gets stored as empty string key path

Merge 96007 - IndexedDB: Null key path gets stored as empty string key path
https://bugs.webkit.org/show_bug.cgi?id=68726

Patch by Joshua Bell <jsbell@chromium.org>; on 2011-09-26
Reviewed by Tony Chang.

Store additional flag to indicate if object store key path
is null vs. empty. Added additional runtime tests for integrity
of object store metadata.

* storage/IDBLevelDBBackingStore.cpp:
(WebCore::checkObjectStoreAndMetaDataType):
(WebCore::IDBLevelDBBackingStore::getObjectStores):
(WebCore::IDBLevelDBBackingStore::createObjectStore):
* storage/IDBLevelDBCoding.cpp:

TBR=commit-queue@webkit.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=97255