Sync: Add DeviceInfo's ChangeProcessor

chrome/browser/sync/glue/synced_device_tracker.h

Index: chrome/browser/sync/glue/synced_device_tracker.h
diff --git a/chrome/browser/sync/glue/synced_device_tracker.h b/chrome/browser/sync/glue/synced_device_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b4e0bb9b1038eb65260d1a8e2be529865948bc8
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+++ b/chrome/browser/sync/glue/synced_device_tracker.h
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+// 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.
+
+#ifndef CHROME_BROWSER_SYNC_GLUE_SYNCED_DEVICE_TRACKER_H_
+#define CHROME_BROWSER_SYNC_GLUE_SYNCED_DEVICE_TRACKER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/sync/glue/change_processor.h"
+
+namespace syncer {
+struct UserShare;
+}
+
+namespace browser_sync {
+
+class DeviceInfo;
+
+class SyncedDeviceTracker : public ChangeProcessor {
+ public:
+  SyncedDeviceTracker(syncer::UserShare* user_share,
+                      const std::string& cache_guid);
+  virtual ~SyncedDeviceTracker();
+
+  // ChangeProcessor methods
+  virtual void StartImpl(Profile* profile) OVERRIDE;
+  virtual void ApplyChangesFromSyncModel(
+      const syncer::BaseTransaction* trans,
+      int64 model_version,
+      const syncer::ImmutableChangeRecordList& changes) OVERRIDE;
+  virtual void CommitChangesFromSyncModel() OVERRIDE;
+
+  // Methods for accessing and updating the device_info list.
+  // These are virtual for testing.
+  virtual scoped_ptr<DeviceInfo> ReadLocalDeviceInfo(
+      const syncer::BaseTransaction &trans);
+  virtual scoped_ptr<DeviceInfo> ReadLocalDeviceInfo();
+  virtual void InitLocalDeviceInfo(const base::Closure& callback);
+
+ private:
+  friend class SyncedDeviceTrackerTest;
+
+  void InitLocalDeviceInfoContinuation(const base::Closure& callback,
+                                       const DeviceInfo& local_info);
+
+  // Helper to write specifics into our node.  Also useful for testing.
+  void WriteLocalDeviceInfo(const DeviceInfo& info);
+
+  base::WeakPtrFactory<SyncedDeviceTracker> weak_factory_;
+
+  syncer::UserShare* user_share_;
+  const std::string cache_guid_;
+  const std::string local_device_info_tag_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncedDeviceTracker);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_SYNCED_DEVICE_TRACKER_H_