sync: Add interfaces for per-type sync

sync/test/engine/mock_update_handler.cc

+// Copyright 2014 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/engine/mock_update_handler.h"
+
+#include "sync/internal_api/public/base/model_type.h"
+
+namespace syncer {
+
+MockUpdateHandler::MockUpdateHandler(ModelType type) {
+  progress_marker_.set_data_type_id(GetSpecificsFieldNumberFromModelType(type));
+  const std::string& token_str =
+      std::string("Mock token: ") + std::string(ModelTypeToString(type));
+  progress_marker_.set_token(token_str);
+}
+
+MockUpdateHandler::~MockUpdateHandler() {}
+
+void MockUpdateHandler::GetDownloadProgress(
+      sync_pb::DataTypeProgressMarker* progress_marker) const {
+  progress_marker->CopyFrom(progress_marker_);
+}
+
+void MockUpdateHandler::ProcessGetUpdatesResponse(
+      const sync_pb::DataTypeProgressMarker& progress_marker,
+      const SyncEntityList& applicable_updates,
+      sessions::StatusController* status) {
+  progress_marker_.CopyFrom(progress_marker);
+}
+
+void MockUpdateHandler::ApplyUpdates(sessions::StatusController* status) {}
+
+void MockUpdateHandler::PassiveApplyUpdates(
+    sessions::StatusController* status) {}
+
+}  // namespace syncer