NOT FOR COMMIT: Add DeviceInfo type and ChangeProcessor

sync/test/mock_transaction_observer.cc

+// Copyright (c) 2012 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 "sync/test/mock_transaction_observer.h"
+
+namespace syncer {
+
+namespace syncable {
+
+MockTransactionObserver::MockTransactionObserver()
+  : weak_ptr_factory_(this),
+    transactions_observed_(0) {
+}
+
+MockTransactionObserver::~MockTransactionObserver() {
+}
+
+int MockTransactionObserver::transactions_observed() {
+  return transactions_observed_;
+}
+
+void MockTransactionObserver::OnTransactionWrite(
+    const ImmutableWriteTransactionInfo& write_transaction_info,
+    ModelTypeSet models_with_changes) {
+  transactions_observed_++;
+}
+
+}  // namespace syncable
+
+}  // namespace syncer