Merge 92155 - [Chromium] WebSQLDatabase version handling is broken in multi-process browsers.

Merge 92155 - [Chromium] WebSQLDatabase version handling is broken in multi-process browsers.
https://bugs.webkit.org/show_bug.cgi?id=65486

The WebCore::AbstractDatabase class maintains a global in-memory map of
the version numbers associated with open database files, but that map is
not reliable in a multi-process system like Chrome. So instead of relying
on the cached values in that map, we read the value from the database (and
update the cached value) where possible. There are two edge cases where that's
not possible because the scriptable interface requires synchronous access
to the version: the .version attribute getter and the .openDatabase() method.
In those cases, we have no choice but to use the potentially stale cached value.

Reviewed by Darin Fisher.

No new tests. Existing layout tests cover the version handling functionality.

* storage/AbstractDatabase.cpp:
(WebCore::AbstractDatabase::version):
(WebCore::AbstractDatabase::performOpenAndVerify):
(WebCore::AbstractDatabase::getVersionFromDatabase):
(WebCore::AbstractDatabase::setVersionInDatabase):
(WebCore::AbstractDatabase::setExpectedVersion):
(WebCore::AbstractDatabase::getCachedVersion):
(WebCore::AbstractDatabase::setCachedVersion):
(WebCore::AbstractDatabase::getActualVersionForTransaction):
* storage/AbstractDatabase.h:
(WebCore::AbstractDatabase::expectedVersion):
* storage/ChangeVersionWrapper.cpp:
(WebCore::ChangeVersionWrapper::handleCommitFailedAfterPostflight):
* storage/ChangeVersionWrapper.h:
* storage/Database.cpp:
(WebCore::Database::openDatabase):
* storage/DatabaseSync.cpp:
(WebCore::DatabaseSync::openDatabaseSync):
(WebCore::DatabaseSync::changeVersion):
* storage/SQLTransaction.cpp:
(WebCore::SQLTransaction::SQLTransaction):
(WebCore::SQLTransaction::executeSQL):
(WebCore::SQLTransaction::openTransactionAndPreflight):
(WebCore::SQLTransaction::runCurrentStatement):
(WebCore::SQLTransaction::postflightAndCommit):
* storage/SQLTransaction.h:
* storage/SQLTransactionSync.cpp:
(WebCore::SQLTransactionSync::SQLTransactionSync):
(WebCore::SQLTransactionSync::executeSQL):
(WebCore::SQLTransactionSync::begin):
* storage/SQLTransactionSync.h:


TBR=michaeln@google.com
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=92305