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diff --git a/apps/shell_window_registry.h b/apps/shell_window_registry.h
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+++ b/apps/shell_window_registry.h
@@ -0,0 +1,151 @@
+// Copyright 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 APPS_SHELL_WINDOW_REGISTRY_H_
+#define APPS_SHELL_WINDOW_REGISTRY_H_
+
+#include <list>
+
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "base/observer_list.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+#include "ui/gfx/native_widget_types.h"
+
+class Profile;
+
+namespace content {
+class DevToolsAgentHost;
+class RenderViewHost;
+}
+
+namespace apps {
+
+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 BrowserContextKeyedService {
+ public:
+  class Observer {
+   public:
+    // Called just after a shell window was added.
+    virtual void OnShellWindowAdded(apps::ShellWindow* shell_window) = 0;
+    // Called when the window icon changes.
+    virtual void OnShellWindowIconChanged(apps::ShellWindow* shell_window) = 0;
+    // Called just after a shell window was removed.
+    virtual void OnShellWindowRemoved(apps::ShellWindow* shell_window) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  typedef std::list<apps::ShellWindow*> ShellWindowList;
+  typedef ShellWindowList::const_iterator const_iterator;
+  typedef std::set<std::string> InspectedWindowSet;
+
+  explicit ShellWindowRegistry(Profile* profile);
+  virtual ~ShellWindowRegistry();
+
+  // Returns the instance for the given profile, or NULL if none. This is
+  // a convenience wrapper around ShellWindowRegistry::Factory::GetForProfile.
+  static ShellWindowRegistry* Get(Profile* profile);
+
+  void AddShellWindow(apps::ShellWindow* shell_window);
+  void ShellWindowIconChanged(apps::ShellWindow* shell_window);
+  // Called by |shell_window| when it is activated.
+  void ShellWindowActivated(apps::ShellWindow* shell_window);
+  void RemoveShellWindow(apps::ShellWindow* shell_window);
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // Returns a set of windows owned by the application identified by app_id.
+  ShellWindowList GetShellWindowsForApp(const std::string& app_id) const;
+  const ShellWindowList& shell_windows() const { return shell_windows_; }
+
+  // Close all shell windows associated with an app.
+  void CloseAllShellWindowsForApp(const std::string& app_id);
+
+  // Helper functions to find shell windows with particular attributes.
+  apps::ShellWindow* GetShellWindowForRenderViewHost(
+      content::RenderViewHost* render_view_host) const;
+  apps::ShellWindow* GetShellWindowForNativeWindow(
+      gfx::NativeWindow window) const;
+  // Returns an app window for the given app, or NULL if no shell windows are
+  // open. If there is a window for the given app that is active, that one will
+  // be returned, otherwise an arbitrary window will be returned.
+  apps::ShellWindow* GetCurrentShellWindowForApp(
+      const std::string& app_id) const;
+  // Returns an app window for the given app and window key, or NULL if no shell
+  // window with the key are open. If there is a window for the given app and
+  // key that is active, that one will be returned, otherwise an arbitrary
+  // window will be returned.
+  apps::ShellWindow* GetShellWindowForAppAndKey(
+      const std::string& app_id,
+      const std::string& window_key) const;
+
+  // Returns whether a ShellWindow's ID was last known to have a DevToolsAgent
+  // attached to it, which should be restored during a reload of a corresponding
+  // newly created |render_view_host|.
+  bool HadDevToolsAttached(content::RenderViewHost* render_view_host) const;
+
+  // Returns the shell window for |window|, looking in all profiles.
+  static apps::ShellWindow* GetShellWindowForNativeWindowAnyProfile(
+      gfx::NativeWindow window);
+
+  // Returns true if the number of shell windows registered across all profiles
+  // is non-zero. |window_type_mask| is a bitwise OR filter of
+  // ShellWindow::WindowType, or 0 for any window type.
+  static bool IsShellWindowRegisteredInAnyProfile(int window_type_mask);
+
+  class Factory : public BrowserContextKeyedServiceFactory {
+   public:
+    static ShellWindowRegistry* GetForProfile(Profile* profile, bool create);
+
+    static Factory* GetInstance();
+   private:
+    friend struct DefaultSingletonTraits<Factory>;
+
+    Factory();
+    virtual ~Factory();
+
+    // BrowserContextKeyedServiceFactory
+    virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+        content::BrowserContext* profile) const OVERRIDE;
+    virtual bool ServiceIsCreatedWithBrowserContext() const OVERRIDE;
+    virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
+    virtual content::BrowserContext* GetBrowserContextToUse(
+        content::BrowserContext* context) const OVERRIDE;
+  };
+
+ protected:
+  void OnDevToolsStateChanged(content::DevToolsAgentHost*, bool attached);
+
+ private:
+  // Ensures the specified |shell_window| is included in |shell_windows_|.
+  // Otherwise adds |shell_window| to the back of |shell_windows_|.
+  void AddShellWindowToList(apps::ShellWindow* shell_window);
+
+  // Bring |shell_window| to the front of |shell_windows_|. If it is not in the
+  // list, add it first.
+  void BringToFront(apps::ShellWindow* shell_window);
+
+  Profile* profile_;
+  ShellWindowList shell_windows_;
+  InspectedWindowSet inspected_windows_;
+  ObserverList<Observer> observers_;
+  base::Callback<void(content::DevToolsAgentHost*, bool)> devtools_callback_;
+};
+
+}  // namespace extensions
+
+#endif  // APPS_SHELL_WINDOW_REGISTRY_H_