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diff --git a/chrome/browser/spellcheck_host_metrics.h b/chrome/browser/spellcheck_host_metrics.h
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+++ b/chrome/browser/spellcheck_host_metrics.h
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+// Copyright (c) 2011 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_SPELLCHECK_HOST_METRICS_H_
+#define CHROME_BROWSER_SPELLCHECK_HOST_METRICS_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/hash_tables.h"
+#include "base/time.h"
+#include "base/timer.h"
+
+// A helper object for recording spell-check related histograms.
+// This class encapsulates histogram names and metrics API.
+// This also carries a set of counters for collecting histograms
+// and a timer for making a periodical summary.
+//
+// We expect a user of SpellCheckHost class to instantiate this object,
+// and pass the metrics object to SpellCheckHost's factory method.
+//
+//   metrics.reset(new SpellCheckHostMetrics());
+//   spell_check_host = SpellChecHost::Create(...., metrics.get());
+//
+// The lifetime of the object should be managed by a caller,
+// and the lifetime should be longer than SpellCheckHost instance
+// because SpellCheckHost will use the object.
+class SpellCheckHostMetrics {
+ public:
+  SpellCheckHostMetrics();
+  ~SpellCheckHostMetrics();
+
+  // Collects the number of words in the custom dictionary, which is
+  // to be uploaded via UMA.
+  void RecordCustomWordCountStats(size_t count);
+
+  // Collects status of spellchecking enabling state, which is
+  // to be uploaded via UMA
+  void RecordEnabledStats(bool enabled);
+
+  // Collects a histogram for dictionary corruption rate
+  // to be uploaded via UMA
+  void RecordDictionaryCorruptionStats(bool corrupted);
+
+  // Collects status of spellchecking enabling state, which is
+  // to be uploaded via UMA
+  void RecordCheckedWordStats(const string16& word, bool misspell);
+
+  // Collects a histogram for misspelled word replacement
+  // to be uploaded via UMA
+  void RecordReplacedWordStats(int delta);
+
+  // Collects a histogram for context menu showing as a spell correction
+  // attempt to be uploaded via UMA
+  void RecordSuggestionStats(int delta);
+
+  void OnHistogramTimerExpired();
+
+ private:
+  // Number of corrected words of checked words.
+  int misspelled_word_count_;
+  // Number of checked words.
+  int spellchecked_word_count_;
+  // Number of suggestion list showings.
+  int suggestion_show_count_;
+  // Number of misspelled words replaced by a user.
+  int replaced_word_count_;
+  // Time when first spellcheck happened.
+  base::Time start_time_;
+  // Set of checked words in the hashed form.
+  base::hash_set<std::string> checked_word_hashes_;
+  base::RepeatingTimer<SpellCheckHostMetrics> recording_timer_;
+};
+
+#endif  // CHROME_BROWSER_SPELLCHECK_HOST_METRICS_H_