USS SyncContextProxy / data type activation refactoring

sync/internal_api/public/activation_context.h

+// Copyright 2015 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.
+
+#ifndef SYNC_INTERNAL_API_PUBLIC_ACTIVATION_CONTEXT_H_
+#define SYNC_INTERNAL_API_PUBLIC_ACTIVATION_CONTEXT_H_
+
+#include "base/memory/weak_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
+#include "sync/base/sync_export.h"
+#include "sync/internal_api/public/non_blocking_sync_common.h"
+
+namespace syncer_v2 {
+class ModelTypeProcessor;
+
+// The state passed from ModelTypeProcessor to Sync thread during DataType
+// activation.
+struct SYNC_EXPORT_PRIVATE ActivationContext {
+  ActivationContext();
+  ~ActivationContext();
+
+  // Initial DataTypeState at the moment of activation.
+  DataTypeState data_type_state;
+  // Pending updates from the previous session.
+  // TODO(stanisc): crbug.com/529498: should remove pending updates.
+  UpdateResponseDataList saved_pending_updates;
+  // Task runner for the data type.
+  scoped_refptr<base::SequencedTaskRunner> type_task_runner;
+  // ModelTypeProcessor for the data type.
+  base::WeakPtr<ModelTypeProcessor> type_processor;
+};
+
+}  // namespace syncer_v2
+
+#endif  // SYNC_INTERNAL_API_PUBLIC_ACTIVATION_CONTEXT_H_