IndexedDB 2.0: Massively speedup IDBIndex.get().

IndexedDB 2.0: Massively speedup IDBIndex.get().
https://bugs.webkit.org/show_bug.cgi?id=165802

Reviewed by Alex Christensen.

Source/WebCore:

No new tests (No behavior change to Javascript, table upgrade change covered by API test).

This change upgrades the IndexRecords schema to include the ObjectStore record ID for the referenced record.
It also adds a SQLite Index-by-key on IndexRecords.

This speeds up PerformanceTests/IndexedDB/index-get.html by 15-20x.

* Modules/indexeddb/server/SQLiteIDBBackingStore.cpp:
(WebCore::IDBServer::v3IndexRecordsTableSchema):
(WebCore::IDBServer::v3IndexRecordsTableSchemaAlternate):
(WebCore::IDBServer::v1IndexRecordsIndexSchema):
(WebCore::IDBServer::SQLiteIDBBackingStore::ensureValidIndexRecordsTable):
(WebCore::IDBServer::SQLiteIDBBackingStore::ensureValidIndexRecordsIndex):
(WebCore::IDBServer::SQLiteIDBBackingStore::getOrEstablishDatabaseInfo):
(WebCore::IDBServer::SQLiteIDBBackingStore::createIndex):
(WebCore::IDBServer::SQLiteIDBBackingStore::uncheckedPutIndexKey):
(WebCore::IDBServer::SQLiteIDBBackingStore::uncheckedPutIndexRecord):
(WebCore::IDBServer::SQLiteIDBBackingStore::updateOneIndexForAddRecord):
(WebCore::IDBServer::SQLiteIDBBackingStore::updateAllIndexesForAddRecord):
(WebCore::IDBServer::SQLiteIDBBackingStore::addRecord):
(WebCore::IDBServer::SQLiteIDBBackingStore::getIndexRecord):
(WebCore::IDBServer::SQLiteIDBBackingStore::uncheckedGetIndexRecordForOneKey):
* Modules/indexeddb/server/SQLiteIDBBackingStore.h:

* Modules/indexeddb/server/SQLiteIDBCursor.cpp:
(WebCore::IDBServer::SQLiteIDBCursor::markAsErrored):
(WebCore::IDBServer::SQLiteIDBCursor::internalAdvanceOnce):
* Modules/indexeddb/server/SQLiteIDBCursor.h:
(WebCore::IDBServer::SQLiteIDBCursor::currentRecordRowID):

Tools:

* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* TestWebKitAPI/Tests/WebKit2Cocoa/IDBIndexUpgradeToV2.html: Added.
* TestWebKitAPI/Tests/WebKit2Cocoa/IDBIndexUpgradeToV2.mm: Added.
* TestWebKitAPI/Tests/WebKit2Cocoa/IndexUpgrade.blob: Added.
* TestWebKitAPI/Tests/WebKit2Cocoa/IndexUpgrade.sqlite3: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@209824 268f45cc-cd09-0410-ab3c-d52691b4dbfc