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diff --git a/chrome/browser/sync/engine/sync_cycle_state.h b/chrome/browser/sync/engine/sync_cycle_state.h
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+// Copyright (c) 2006-2009 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.
+
+//
+// The sync process consists of a sequence of sync cycles, each of which
+// (hopefully) moves the client into closer synchronization with the server.
+// This class holds state that is pertinent to a single sync cycle.
+//
+// THIS CLASS PROVIDES NO SYNCHRONIZATION GUARANTEES.
+
+#ifndef CHROME_BROWSER_SYNC_ENGINE_SYNC_CYCLE_STATE_H_
+#define CHROME_BROWSER_SYNC_ENGINE_SYNC_CYCLE_STATE_H_
+
+#include <utility>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "chrome/browser/sync/engine/syncer_types.h"
+#include "chrome/browser/sync/engine/syncproto.h"
+#include "chrome/browser/sync/util/event_sys.h"
+#include "chrome/browser/sync/util/pthread_helpers.h"
+
+namespace syncable {
+class WriteTransaction;
+class Id;
+}  // namespace syncable
+
+namespace browser_sync {
+
+typedef std::pair<VerifyResult, sync_pb::SyncEntity> VerifiedUpdate;
+typedef std::pair<UpdateAttemptResponse, syncable::Id> AppliedUpdate;
+
+// This is the type declaration for the eventsys channel that the syncer
+// uses to send events to other system components.
+struct SyncerEvent;
+
+// SyncCycleState holds the entire state of a single sync cycle;
+// GetUpdates, Commit, and Conflict Resolution. After said cycle, the
+// State may contain items that were unable to be processed because of
+// errors.
+class SyncCycleState {
+ public:
+  SyncCycleState()
+      : write_transaction_(NULL),
+        conflict_sets_built_(false),
+        conflicts_resolved_(false),
+        items_committed_(false),
+        over_quota_(false),
+        dirty_(true),
+        timestamp_dirty_(false) {}
+
+  void set_update_response(const ClientToServerResponse& update_response) {
+    update_response_.CopyFrom(update_response);
+  }
+
+  const ClientToServerResponse& update_response() const {
+    return update_response_;
+  }
+
+  void set_commit_response(const ClientToServerResponse& commit_response) {
+    commit_response_.CopyFrom(commit_response);
+  }
+
+  const ClientToServerResponse& commit_response() const {
+    return commit_response_;
+  }
+
+  void AddVerifyResult(const VerifyResult& verify_result,
+                       const sync_pb::SyncEntity& entity) {
+    verified_updates_.push_back(std::make_pair(verify_result, entity));
+  }
+
+  bool HasVerifiedUpdates() const {
+    return !verified_updates_.empty();
+  }
+
+  // Log a successful or failing update attempt.
+  void AddAppliedUpdate(const UpdateAttemptResponse& response,
+                        const syncable::Id& id) {
+    applied_updates_.push_back(std::make_pair(response, id));
+  }
+
+  bool HasAppliedUpdates() const {
+    return !applied_updates_.empty();
+  }
+
+  std::vector<AppliedUpdate>::iterator AppliedUpdatesBegin() {
+    return applied_updates_.begin();
+  }
+
+  std::vector<VerifiedUpdate>::iterator VerifiedUpdatesBegin() {
+    return verified_updates_.begin();
+  }
+
+  std::vector<AppliedUpdate>::iterator AppliedUpdatesEnd() {
+    return applied_updates_.end();
+  }
+
+  std::vector<VerifiedUpdate>::iterator VerifiedUpdatesEnd() {
+    return verified_updates_.end();
+  }
+
+  // Returns the number of update application attempts.  This includes
+  // both failures and successes.
+  int AppliedUpdatesSize() const {
+    return applied_updates_.size();
+  }
+
+  // Count the number of successful update applications that have happend
+  // this cycle.  Note that if an item is successfully applied twice,
+  // it will be double counted here.
+  int SuccessfullyAppliedUpdateCount() const {
+    int count = 0;
+    for (std::vector<AppliedUpdate>::const_iterator it =
+             applied_updates_.begin();
+         it != applied_updates_.end();
+         ++it) {
+      if (it->first == SUCCESS)
+        count++;
+    }
+    return count;
+  }
+
+  int VerifiedUpdatesSize() const {
+    return verified_updates_.size();
+  }
+
+  const std::vector<int64>& unsynced_handles() const {
+    return unsynced_handles_;
+  }
+
+  void set_unsynced_handles(const std::vector<int64>& unsynced_handles) {
+    UpdateDirty(unsynced_handles != unsynced_handles_);
+    unsynced_handles_ = unsynced_handles;
+  }
+
+  int64 unsynced_count() const { return unsynced_handles_.size(); }
+
+  const std::vector<syncable::Id>& commit_ids() const { return commit_ids_; }
+
+  void set_commit_ids(const std::vector<syncable::Id>& commit_ids) {
+    commit_ids_ = commit_ids;
+  }
+
+  bool commit_ids_empty() const { return commit_ids_.empty(); }
+
+  // The write transaction must be deleted by the caller of this function.
+  void set_write_transaction(syncable::WriteTransaction* write_transaction) {
+    DCHECK(!write_transaction_) << "Forgot to clear the write transaction.";
+    write_transaction_ = write_transaction;
+  }
+
+  syncable::WriteTransaction* write_transaction() const {
+    return write_transaction_;
+  }
+
+  bool has_open_write_transaction() { return write_transaction_ != NULL; }
+
+  // sets the write transaction to null, but doesn't free the memory.
+  void ClearWriteTransaction() { write_transaction_ = NULL; }
+
+  ClientToServerMessage* commit_message() { return &commit_message_; }
+
+  void set_commit_message(ClientToServerMessage message) {
+    commit_message_ = message;
+  }
+
+  void set_conflict_sets_built(bool b) {
+    conflict_sets_built_ = b;
+  }
+
+  bool conflict_sets_built() const {
+    return conflict_sets_built_;
+  }
+
+  void set_conflicts_resolved(bool b) {
+    conflicts_resolved_ = b;
+  }
+
+  bool conflicts_resolved() const {
+    return conflicts_resolved_;
+  }
+
+  void set_over_quota(bool b) {
+    UpdateDirty(b != over_quota_);
+    over_quota_ = b;
+  }
+
+  bool over_quota() const {
+    return over_quota_;
+  }
+
+  void set_items_committed(bool b) { items_committed_ = b; }
+
+  void set_item_committed() { items_committed_ |= true; }
+
+  bool items_committed() const { return items_committed_; }
+
+
+  // Returns true if this object has been modified since last SetClean() call
+  bool IsDirty() const { return dirty_; }
+
+  // Call to tell this status object that its new state has been seen
+  void SetClean() { dirty_ = false; }
+
+  // Indicate that we've made a change to directory timestamp.
+  void set_timestamp_dirty() {
+    timestamp_dirty_ = true;
+  }
+
+  bool is_timestamp_dirty() const {
+    return timestamp_dirty_;
+  }
+
+
+ private:
+  void UpdateDirty(bool new_info) { dirty_ |= new_info; }
+
+  // download updates supplies:
+  ClientToServerResponse update_response_;
+  ClientToServerResponse commit_response_;
+  ClientToServerMessage commit_message_;
+
+  syncable::WriteTransaction* write_transaction_;
+  std::vector<int64> unsynced_handles_;
+  std::vector<syncable::Id> commit_ids_;
+
+  // At a certain point during the sync process we'll want to build the
+  // conflict sets. This variable tracks whether or not that has happened.
+  bool conflict_sets_built_;
+  bool conflicts_resolved_;
+  bool items_committed_;
+  bool over_quota_;
+
+  // If we've set the timestamp to a new value during this cycle.
+  bool timestamp_dirty_;
+
+  bool dirty_;
+
+  // some container for updates that failed verification
+  std::vector<VerifiedUpdate> verified_updates_;
+
+  // Stores the result of the various ApplyUpdate attempts we've made.
+  // May contain duplicate entries.
+  std::vector<AppliedUpdate> applied_updates_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncCycleState);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_ENGINE_SYNC_CYCLE_STATE_H_