NOT FOR COMMIT: Add DeviceInfo type and 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..cc32ae7aff4111a391b6a1f8e1120425956c9eac
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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/weak_ptr.h"
+#include "chrome/browser/sync/glue/change_processor.h"
+#include "sync/protocol/sync.pb.h"
+
+namespace browser_sync {
+
+class DeviceInfo;
+
+class SyncedDeviceTracker : public ChangeProcessor {
+ public:
+  SyncedDeviceTracker();
+  virtual ~SyncedDeviceTracker();
+
+  // ChangeProcessor methods
+  virtual void StartImpl(Profile* profile) OVERRIDE;
+  virtual void StopImpl() OVERRIDE;
+  virtual void ApplyChangesFromSyncModel(
+      const syncer::BaseTransaction* trans,
+      const syncer::ImmutableChangeRecordList& changes) OVERRIDE;
+  virtual void CommitChangesFromSyncModel() OVERRIDE;
+
+  // Methods for accessing and updating the device_info list.
+  bool ReadLocalDeviceInfo(const syncer::BaseTransaction &trans,
+                          DeviceInfo* out);
+  bool ReadLocalDeviceInfo(DeviceInfo* out);
+  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_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncedDeviceTracker);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_SYNCED_DEVICE_TRACKER_H_