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diff --git a/chrome/browser/sync/sessions/status_controller.h b/chrome/browser/sync/sessions/status_controller.h
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+// Copyright (c) 2009 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.
+
+// StatusController handles all counter and status related number crunching and
+// state tracking on behalf of a SyncSession.  It 'controls' the model data
+// defined in session_state.h.  It can track if changes occur to certain parts
+// of state so that various parts of the sync engine can avoid broadcasting
+// notifications if no changes occurred.  It also separates transient state
+// from long-lived SyncSession state for explicitness and to facilitate
+// resetting transient state.
+
+#ifndef CHROME_BROWSER_SYNC_SESSIONS_STATUS_CONTROLLER_H_
+#define CHROME_BROWSER_SYNC_SESSIONS_STATUS_CONTROLLER_H_
+
+#include "base/scoped_ptr.h"
+#include "chrome/browser/sync/sessions/session_state.h"
+
+namespace browser_sync {
+namespace sessions {
+
+class StatusController {
+ public:
+  StatusController();
+
+  // Returns true if some portion of the session state has changed (is dirty)
+  // since it was created or was last reset.
+  bool TestAndClearIsDirty();
+
+  // Discards the current transient state components that should not carry over
+  // to a subsequent sync cycle (a run between states in SyncShare), and keeps
+  // everything else intact. After the call, |this| is ready for use
+  // as part of a new sync cycle.
+  void ResetTransientState();
+
+  ConflictProgress const* conflict_progress() const {
+    return &conflict_progress_;
+  }
+  ConflictProgress* mutable_conflict_progress() {
+    return &conflict_progress_;
+  }
+  const UpdateProgress& update_progress() {
+    return transient_->value()->update_progress;
+  }
+  UpdateProgress* mutable_update_progress() {
+    return &transient_->value()->update_progress;
+  }
+  ClientToServerMessage* mutable_commit_message() {
+    return &transient_->value()->commit_message;
+  }
+  const ClientToServerResponse& commit_response() const {
+    return transient_->value()->commit_response;
+  }
+  ClientToServerResponse* mutable_commit_response() {
+    return &transient_->value()->commit_response;
+  }
+  const ClientToServerResponse& updates_response() {
+    return transient_->value()->updates_response;
+  }
+  ClientToServerResponse* mutable_updates_response() {
+    return &transient_->value()->updates_response;
+  }
+  const ErrorCounters& error_counters() const {
+    return error_counters_.value();
+  }
+  const SyncerStatus& syncer_status() const {
+    return syncer_status_.value();
+  }
+  const ChangelogProgress& change_progress() const {
+    return change_progress_.value();
+  }
+  const std::vector<syncable::Id>& commit_ids() const {
+    return transient_->value()->commit_ids;
+  }
+  const std::vector<int64>& unsynced_handles() const {
+    return transient_->value()->unsynced_handles;
+  }
+  bool conflict_sets_built() const {
+    return transient_->value()->conflict_sets_built;
+  }
+  bool conflicts_resolved() const {
+    return transient_->value()->conflicts_resolved;
+  }
+  bool timestamp_dirty() const {
+    return transient_->value()->timestamp_dirty;
+  }
+  bool did_commit_items() const {
+    return transient_->value()->items_committed;
+  }
+
+  // Returns the number of updates received from the sync server.
+  int64 CountUpdates() const;
+
+  bool got_zero_updates() const { return CountUpdates() == 0; }
+
+  // A toolbelt full of methods for updating counters and flags.
+  void set_num_conflicting_commits(int value);
+  void set_num_consecutive_problem_get_updates(int value);
+  void increment_num_consecutive_problem_get_updates();
+  void set_num_consecutive_problem_commits(int value);
+  void increment_num_consecutive_problem_commits();
+  void set_num_consecutive_transient_error_commits(int value);
+  void increment_num_consecutive_transient_error_commits_by(int value);
+  void set_num_consecutive_errors(int value);
+  void increment_num_consecutive_errors();
+  void increment_num_consecutive_errors_by(int value);
+  void set_current_sync_timestamp(int64 current_timestamp);
+  void set_num_server_changes_remaining(int64 changes_remaining);
+  void set_over_quota(bool over_quota);
+  void set_invalid_store(bool invalid_store);
+  void set_syncer_stuck(bool syncer_stuck);
+  void set_syncing(bool syncing);
+  void set_num_successful_commits(int value);
+  void increment_num_successful_commits();
+  void set_unsynced_handles(const std::vector<int64>& unsynced_handles);
+
+  void set_commit_ids(const std::vector<syncable::Id>& commit_ids);
+  void set_conflict_sets_built(bool built);
+  void set_conflicts_resolved(bool resolved);
+  void set_items_committed(bool items_committed);
+  void set_timestamp_dirty(bool dirty);
+
+ private:
+  // Dirtyable keeps a dirty bit that can be set, cleared, and checked to
+  // determine if a notification should be sent due to state change.
+  // This is useful when applied to any session state object if you want to know
+  // that some part of that object changed.
+  template <typename T>
+  class Dirtyable {
+   public:
+    Dirtyable() : dirty_(false) {}
+    void set_dirty() { dirty_ = true; }
+    bool TestAndClearIsDirty();
+    T* value() { return &t_; }
+    const T& value() const { return t_; }
+   private:
+    T t_;
+    bool dirty_;
+  };
+
+  // Various pieces of state we track dirtiness of.
+  Dirtyable<ChangelogProgress> change_progress_;
+  Dirtyable<SyncerStatus> syncer_status_;
+  Dirtyable<ErrorCounters> error_counters_;
+
+  // The transient parts of a sync session that can be reset during the session.
+  // For some parts of this state, we want to track whether changes occurred so
+  // we allocate a Dirtyable version.
+  scoped_ptr<Dirtyable<TransientState> > transient_;
+
+  ConflictProgress conflict_progress_;
+
+  DISALLOW_COPY_AND_ASSIGN(StatusController);
+};
+
+}
+}
+
+#endif  // CHROME_BROWSER_SYNC_SESSIONS_STATUS_CONTROLLER_H_