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diff --git a/chrome/browser/extensions/shell_window_registry.h b/chrome/browser/extensions/shell_window_registry.h
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+++ b/chrome/browser/extensions/shell_window_registry.h
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+// 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 CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_REGISTRY_H_
+#define CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_REGISTRY_H_
+#pragma once
+
+#include <set>
+
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+
+class Profile;
+class ShellWindow;
+
+// The ShellWindowRegistry tracks the ShellWindows for all platform apps for a
+// particular profile.
+// This class is planned to evolve into tracking all PlatformApps for a
+// particular profile, with a PlatformApp encapsulating all views (background
+// page, shell windows, tray view, panels etc.) and other app level behaviour
+// (e.g. notifications the app is interested in, lifetime of the background
+// page).
+class ShellWindowRegistry : public ProfileKeyedService {
+ public:
+  typedef std::set<ShellWindow*> ShellWindowSet;
+  typedef ShellWindowSet::const_iterator const_iterator;
+
+  ShellWindowRegistry();
+  virtual ~ShellWindowRegistry();
+
+  // Returns the instance for the given profile, or NULL if none. This is
+  // a convenience wrapper around ShellWindowRegistryFactory::GetForProfile.
+  static ShellWindowRegistry* Get(Profile* profile);
+
+  void AddShellWindow(ShellWindow* shell_window);
+  void RemoveShellWindow(ShellWindow* shell_window);
+
+  const ShellWindowSet& shell_windows() const { return shell_windows_; }
+
+ private:
+  class Factory : public ProfileKeyedServiceFactory {
+   public:
+    static ShellWindowRegistry* GetForProfile(Profile* profile);
+
+    static Factory* GetInstance();
+   private:
+    friend struct DefaultSingletonTraits<Factory>;
+
+    Factory();
+    virtual ~Factory();
+
+    // ProfileKeyedServiceFactory
+    virtual ProfileKeyedService* BuildServiceInstanceFor(
+        Profile* profile) const OVERRIDE;
+    virtual bool ServiceIsCreatedWithProfile() OVERRIDE;
+    virtual bool ServiceIsNULLWhileTesting() OVERRIDE;
+  };
+
+  ShellWindowSet shell_windows_;
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_REGISTRY_H_