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diff --git a/sync/internal_api/all_status.h b/sync/internal_api/all_status.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.
+//
+// The AllStatus object watches various sync engine components and aggregates
+// the status of all of them into one place.
+
+#ifndef SYNC_INTERNAL_API_ALL_STATUS_H_
+#define SYNC_INTERNAL_API_ALL_STATUS_H_
+#pragma once
+
+#include <map>
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
+#include "sync/engine/syncer_types.h"
+#include "sync/internal_api/sync_manager.h"
+#include "sync/syncable/model_type.h"
+
+namespace browser_sync {
+
+class ScopedStatusLock;
+struct ServerConnectionEvent;
+
+// TODO(rlarocque):
+// Most of this data ends up on the about:sync page.  But the page is only
+// 'pinged' to update itself at the end of a sync cycle.  A user could refresh
+// manually, but unless their timing is excellent it's unlikely that a user will
+// see any state in mid-sync cycle.  We have no plans to change this.
+//
+// What we do intend to do is improve the UI so that changes following a sync
+// cycle are more visible.  Without such a change, the status summary for a
+// healthy syncer will constantly display as "READY" and never provide any
+// indication of a sync cycle being performed.  See crbug.com/108100.
+
+class AllStatus : public SyncEngineEventListener {
+  friend class ScopedStatusLock;
+ public:
+  AllStatus();
+  virtual ~AllStatus();
+
+  virtual void OnSyncEngineEvent(const SyncEngineEvent& event) OVERRIDE;
+
+  sync_api::SyncManager::Status status() const;
+
+  void SetNotificationsEnabled(bool notifications_enabled);
+
+  void IncrementNotifiableCommits();
+
+  void IncrementNotificationsReceived();
+
+  void SetEncryptedTypes(syncable::ModelTypeSet types);
+  void SetCryptographerReady(bool ready);
+  void SetCryptoHasPendingKeys(bool has_pending_keys);
+
+  void SetUniqueId(const std::string& guid);
+
+ protected:
+  // Examines syncer to calculate syncing and the unsynced count,
+  // and returns a Status with new values.
+  sync_api::SyncManager::Status CalcSyncing(const SyncEngineEvent& event) const;
+  sync_api::SyncManager::Status CreateBlankStatus() const;
+
+  sync_api::SyncManager::Status status_;
+
+  mutable base::Lock mutex_;  // Protects all data members.
+  DISALLOW_COPY_AND_ASSIGN(AllStatus);
+};
+
+class ScopedStatusLock {
+ public:
+  explicit ScopedStatusLock(AllStatus* allstatus);
+  ~ScopedStatusLock();
+ protected:
+  AllStatus* allstatus_;
+};
+
+}  // namespace browser_sync
+
+#endif  // SYNC_INTERNAL_API_ALL_STATUS_H_