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diff --git a/sync/engine/process_commit_response_command.h b/sync/engine/process_commit_response_command.h
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+++ b/sync/engine/process_commit_response_command.h
@@ -0,0 +1,101 @@
+// 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 SYNC_ENGINE_PROCESS_COMMIT_RESPONSE_COMMAND_H_
+#define SYNC_ENGINE_PROCESS_COMMIT_RESPONSE_COMMAND_H_
+#pragma once
+
+#include <set>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "sync/engine/model_changing_syncer_command.h"
+#include "sync/engine/syncproto.h"
+
+namespace syncable {
+class Id;
+class WriteTransaction;
+class MutableEntry;
+}
+
+namespace browser_sync {
+
+class ProcessCommitResponseCommand : public ModelChangingSyncerCommand {
+ public:
+
+  ProcessCommitResponseCommand();
+  virtual ~ProcessCommitResponseCommand();
+
+ protected:
+  // ModelChangingSyncerCommand implementation.
+  virtual std::set<ModelSafeGroup> GetGroupsToChange(
+      const sessions::SyncSession& session) const OVERRIDE;
+  virtual SyncerError ModelNeutralExecuteImpl(
+      sessions::SyncSession* session) OVERRIDE;
+  virtual SyncerError ModelChangingExecuteImpl(
+      sessions::SyncSession* session) OVERRIDE;
+
+ private:
+  CommitResponse::ResponseType ProcessSingleCommitResponse(
+      syncable::WriteTransaction* trans,
+      const sync_pb::CommitResponse_EntryResponse& pb_commit_response,
+      const sync_pb::SyncEntity& pb_committed_entry,
+      const syncable::Id& pre_commit_id,
+      std::set<syncable::Id>* conflicting_new_directory_ids,
+      std::set<syncable::Id>* deleted_folders);
+
+  // Actually does the work of execute.
+  SyncerError ProcessCommitResponse(sessions::SyncSession* session);
+
+  void ProcessSuccessfulCommitResponse(
+      const sync_pb::SyncEntity& committed_entry,
+      const CommitResponse_EntryResponse& entry_response,
+      const syncable::Id& pre_commit_id, syncable::MutableEntry* local_entry,
+      bool syncing_was_set, std::set<syncable::Id>* deleted_folders);
+
+  // Update the BASE_VERSION and SERVER_VERSION, post-commit.
+  // Helper for ProcessSuccessfulCommitResponse.
+  bool UpdateVersionAfterCommit(
+      const sync_pb::SyncEntity& committed_entry,
+      const CommitResponse_EntryResponse& entry_response,
+      const syncable::Id& pre_commit_id,
+      syncable::MutableEntry* local_entry);
+
+  // If the server generated an ID for us during a commit, apply the new ID.
+  // Helper for ProcessSuccessfulCommitResponse.
+  bool ChangeIdAfterCommit(
+      const CommitResponse_EntryResponse& entry_response,
+      const syncable::Id& pre_commit_id,
+      syncable::MutableEntry* local_entry);
+
+  // Update the SERVER_ fields to reflect the server state after committing.
+  // Helper for ProcessSuccessfulCommitResponse.
+  void UpdateServerFieldsAfterCommit(
+      const sync_pb::SyncEntity& committed_entry,
+      const CommitResponse_EntryResponse& entry_response,
+      syncable::MutableEntry* local_entry);
+
+  // The server can override some values during a commit; the overridden values
+  // are returned as fields in the CommitResponse_EntryResponse.  This method
+  // stores the fields back in the client-visible (i.e. not the SERVER_* fields)
+  // fields of the entry.  This should only be done if the item did not change
+  // locally while the commit was in flight.
+  // Helper for ProcessSuccessfulCommitResponse.
+  void OverrideClientFieldsAfterCommit(
+      const sync_pb::SyncEntity& committed_entry,
+      const CommitResponse_EntryResponse& entry_response,
+      syncable::MutableEntry* local_entry);
+
+  // Helper to extract the final name from the protobufs.
+  const std::string& GetResultingPostCommitName(
+      const sync_pb::SyncEntity& committed_entry,
+      const CommitResponse_EntryResponse& entry_response);
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessCommitResponseCommand);
+};
+
+}  // namespace browser_sync
+
+#endif  // SYNC_ENGINE_PROCESS_COMMIT_RESPONSE_COMMAND_H_