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diff --git a/chrome/browser/spellchecker/feedback.h b/chrome/browser/spellchecker/feedback.h
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+++ b/chrome/browser/spellchecker/feedback.h
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+// Copyright (c) 2013 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_SPELLCHECKER_FEEDBACK_H_
+#define CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_
+
+#include <map>
+#include <vector>
+
+#include "chrome/browser/spellchecker/misspelling.h"
+
+namespace spellcheck {
+
+// Stores feedback for the spelling service in |Misspelling| objects. Each
+// |Misspelling| object is identified by a |hash| and corresponds to a document
+// marker  with the same |hash| identifier in the renderer.
+class Feedback {
+ public:
+  Feedback();
+  ~Feedback();
+
+  // Returns the misspelling identified by |hash|. Returns NULL if there's no
+  // misspelling identified by |hash|. Retains the ownership of the result.
+  Misspelling* GetMisspelling(uint32 hash);
+
+  // Finalizes the user actions on misspellings that are removed from the
+  // renderer process with ID |renderer_process_id|.
+  void FinalizeRemovedMisspellings(
+      int renderer_process_id,
+      const std::vector<uint32>& remaining_markers);
+
+  // Returns true if the renderer with process ID |renderer_process_id| has
+  // misspellings. Otherwise returns false.
+  bool RendererHasMisspellings(int renderer_process_id) const;
+
+  // Returns a copy of the misspellings in renderer with process ID
+  // |renderer_process_id|.
+  std::vector<Misspelling> GetMisspellingsInRenderer(
+      int renderer_process_id) const;
+
+  // Erases the misspellings with final user actions in the renderer with
+  // process ID |renderer_process_id|.
+  void EraseFinalizedMisspellings(int renderer_process_id);
+
+  // Returns true if there's a misspelling with |hash| identifier. Otherwise
+  // returns false.
+  bool HasMisspelling(uint32 hash) const;
+
+  // Adds the |misspelling| to feedback data. If the |misspelling| has a
+  // duplicate hash, then replaces the existing misspelling with the same hash.
+  void AddMisspelling(int renderer_process_id, const Misspelling& misspelling);
+
+  // Returns true if there're no misspellings. Otherwise returns false.
+  bool Empty() const;
+
+  // Returns a list of process identifiers for renderers that have misspellings.
+  std::vector<int> GetRendersWithMisspellings() const;
+
+  // Finalizes all misspellings.
+  void FinalizeAllMisspellings();
+
+  // Returns a copy of all misspellings.
+  std::vector<Misspelling> GetAllMisspellings() const;
+
+  // Removes all misspellings.
+  void Clear();
+
+ private:
+  // A map of hashes that identify document markers to feedback data to be sent
+  // to spelling service.
+  std::map<uint32, Misspelling> misspellings_;
+
+  // A map of renderer process ID to hashes that identify misspellings.
+  std::map<int, std::vector<uint32> > hashes_;
+
+  DISALLOW_COPY_AND_ASSIGN(Feedback);
+};
+
+}  // namespace spellcheck
+
+#endif  // CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_