[sql] Callback and scoped-ignore tests for sql::Statement.

sql/test/error_callback_support.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sql/test/error_callback_support.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace sql {
+
+void CaptureErrorCallback(int* error_pointer, int error, sql::Statement* stmt) {
+  *error_pointer = error;
+}
+
+ScopedErrorCallback::ScopedErrorCallback(
+    sql::Connection* db,
+    const sql::Connection::ErrorCallback& cb)
+    : db_(db) {
+  // Make sure someone isn't trying to nest things.
+  EXPECT_FALSE(db_->has_error_callback());
+  db_->set_error_callback(cb);
+}
+
+ScopedErrorCallback::~ScopedErrorCallback() {
+  db_->reset_error_callback();
+}
+
+}  // namespace