IndexedDB: Move method precondition checks to front end objects

IndexedDB: Move method precondition checks to front end objects
https://bugs.webkit.org/show_bug.cgi?id=89377

Reviewed by Tony Chang.

Now that metadata exists on the front end, most of the pre-condition validation checks
done on IDB method calls from script can be moved to the front end which simplifies the
code significantly in the case of complex methods like IDBObjectStore::put().

Adds an internal "active" flag for transactions, although the behavior is not accurate
to the spec (it should only be true during event callbacks - http://webkit.org/b/89379).
The back-end methods can then be simplifed to just adding async tasks to the transaction,
and the front end methods can take care of all exception cases except for asynchronous
transaction abort which still requires plumbing back to the front end.

No functional changes - no new tests.

* Modules/indexeddb/IDBCursor.cpp:
(WebCore::IDBCursor::update): Migrate from IDBObjectStoreBackendImpl::put.
(WebCore::IDBCursor::advance): Add more explicit transaction-is-active check.
(WebCore::IDBCursor::continueFunction): Ditto.
(WebCore::IDBCursor::deleteFunction): Ditto.
(WebCore::IDBCursor::effectiveObjectStore): Convenience function (source may be store or index).
(WebCore):
* Modules/indexeddb/IDBCursor.h:
(WebCore::IDBCursor::isKeyCursor): Distinguish from IDBCursorWithValue.
(IDBCursor):
* Modules/indexeddb/IDBCursorBackendImpl.cpp:
(WebCore::IDBCursorBackendImpl::update): Remove migrated check.
* Modules/indexeddb/IDBCursorWithValue.h:
(IDBCursorWithValue):
* Modules/indexeddb/IDBDatabase.cpp: Migrate checks.
(WebCore::IDBDatabase::createObjectStore):
(WebCore::IDBDatabase::deleteObjectStore):
* Modules/indexeddb/IDBDatabaseBackendImpl.cpp: Replace checks with assertions.
(WebCore::IDBDatabaseBackendImpl::createObjectStore):
(WebCore::IDBDatabaseBackendImpl::deleteObjectStore):
* Modules/indexeddb/IDBIndex.cpp: Add transaction-is-active checks.
(WebCore::IDBIndex::openCursor):
(WebCore::IDBIndex::count):
(WebCore::IDBIndex::openKeyCursor):
(WebCore::IDBIndex::get):
(WebCore::IDBIndex::getKey):
* Modules/indexeddb/IDBObjectStore.cpp: Migrate cehcks.
(WebCore::IDBObjectStore::get):
(WebCore::IDBObjectStore::add): Delegates to put(PutMode)
(WebCore::IDBObjectStore::put): Delegates to put(PutMode)
(WebCore): Adds put(PutMode) which has the unified checks migrated from
IDBObjectStoreBackendImpl::put.
(WebCore::IDBObjectStore::deleteFunction):
(WebCore::IDBObjectStore::clear):
(WebCore::IDBObjectStore::createIndex):
(WebCore::IDBObjectStore::deleteIndex):
(WebCore::IDBObjectStore::openCursor):
(WebCore::IDBObjectStore::count):
* Modules/indexeddb/IDBObjectStore.h: Adds put(PutMode).
(IDBObjectStore):
* Modules/indexeddb/IDBObjectStoreBackendImpl.cpp:
(WebCore::IDBObjectStoreBackendImpl::getInternal): Fix trace symbol.
(WebCore::IDBObjectStoreBackendImpl::put): Remove migrated checks.
(WebCore::IDBObjectStoreBackendImpl::createIndex): Remove migrated checks.
(WebCore::IDBObjectStoreBackendImpl::deleteIndex): Remove migrated checks.
* Modules/indexeddb/IDBTransaction.cpp: Add active flag tracking.
(WebCore::IDBTransaction::IDBTransaction):
(WebCore::IDBTransaction::abort):
(WebCore::IDBTransaction::onAbort):
(WebCore::IDBTransaction::onComplete):
* Modules/indexeddb/IDBTransaction.h:
(WebCore::IDBTransaction::isActive):
(WebCore::IDBTransaction::isReadOnly): Group IDL/non-IDL methods.
(IDBTransaction):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121291 268f45cc-cd09-0410-ab3c-d52691b4dbfc