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diff --git a/chrome/browser/host_zoom_map.h b/chrome/browser/host_zoom_map.h
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+// Copyright (c) 2010 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.
+
+// Maps hostnames to custom zoom levels.  Written on the UI thread and read on
+// any thread.  One instance per profile.
+
+#ifndef CHROME_BROWSER_HOST_ZOOM_MAP_H_
+#define CHROME_BROWSER_HOST_ZOOM_MAP_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/lock.h"
+#include "base/ref_counted.h"
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_registrar.h"
+
+class GURL;
+class PrefService;
+class Profile;
+
+class HostZoomMap : public NotificationObserver,
+                    public base::RefCountedThreadSafe<HostZoomMap> {
+ public:
+  explicit HostZoomMap(Profile* profile);
+
+  static void RegisterUserPrefs(PrefService* prefs);
+
+  // Returns the zoom level for a given url. The zoom level is determined by
+  // the host portion of the URL, or (in the absence of a host) the complete
+  // spec of the URL. In most cases, there is no custom zoom level, and this
+  // returns 0.  Otherwise, returns the saved zoom level, which may be positive
+  // (to zoom in) or negative (to zoom out).
+  //
+  // This may be called on any thread.
+  int GetZoomLevel(const GURL& url) const;
+
+  // Sets the zoom level for a given url to |level|.  If the level is 0,
+  // the host is erased from the saved preferences; otherwise the new value is
+  // written out.
+  //
+  // This should only be called on the UI thread.
+  void SetZoomLevel(const GURL& url, int level);
+
+  // Resets all zoom levels.
+  //
+  // This should only be called on the UI thread.
+  void ResetToDefaults();
+
+  // NotificationObserver implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+ private:
+  friend class base::RefCountedThreadSafe<HostZoomMap>;
+
+  typedef std::map<std::string, int> HostZoomLevels;
+
+  ~HostZoomMap();
+
+  // Reads the zoom levels from the preferences service.
+  void Load();
+
+  // Removes dependencies on the profile so we can live longer than
+  // the profile without crashing.
+  void Shutdown();
+
+  // The profile we're associated with.
+  Profile* profile_;
+
+  // Copy of the pref data, so that we can read it on the IO thread.
+  HostZoomLevels host_zoom_levels_;
+
+  // Used around accesses to |host_zoom_levels_| to guarantee thread safety.
+  mutable Lock lock_;
+
+  // Whether we are currently updating preferences, this is used to ignore
+  // notifications from the preference service that we triggered ourself.
+  bool updating_preferences_;
+
+  NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(HostZoomMap);
+};
+
+#endif  // CHROME_BROWSER_HOST_ZOOM_MAP_H_