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diff --git a/ash/wm/panels/panel_layout_manager.h b/ash/wm/panels/panel_layout_manager.h
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+++ b/ash/wm/panels/panel_layout_manager.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 ASH_WM_PANELS_PANEL_LAYOUT_MANAGER_H_
+#define ASH_WM_PANELS_PANEL_LAYOUT_MANAGER_H_
+
+#include <list>
+
+#include "ash/ash_export.h"
+#include "ash/launcher/launcher_icon_observer.h"
+#include "ash/shell_observer.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "ui/aura/client/activation_change_observer.h"
+#include "ui/aura/layout_manager.h"
+#include "ui/aura/window_observer.h"
+
+namespace aura {
+class Window;
+}
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+class Widget;
+}
+
+namespace ash {
+class Launcher;
+
+namespace internal {
+class PanelCalloutWidget;
+
+// PanelLayoutManager is responsible for organizing panels within the
+// workspace. It is associated with a specific container window (i.e.
+// kShellWindowId_PanelContainer) and controls the layout of any windows
+// added to that container.
+//
+// The constructor takes a |panel_container| argument which is expected to set
+// its layout manager to this instance, e.g.:
+// panel_container->SetLayoutManager(new PanelLayoutManager(panel_container));
+
+class ASH_EXPORT PanelLayoutManager
+    : public aura::LayoutManager,
+      public ash::LauncherIconObserver,
+      public ash::ShellObserver,
+      public aura::WindowObserver,
+      public aura::client::ActivationChangeObserver {
+ public:
+  explicit PanelLayoutManager(aura::Window* panel_container);
+  virtual ~PanelLayoutManager();
+
+  // Call Shutdown() before deleting children of panel_container.
+  void Shutdown();
+
+  void StartDragging(aura::Window* panel);
+  void FinishDragging();
+
+  void ToggleMinimize(aura::Window* panel);
+
+  ash::Launcher* launcher() { return launcher_; }
+  void SetLauncher(ash::Launcher* launcher);
+
+  // Overridden from aura::LayoutManager:
+  virtual void OnWindowResized() OVERRIDE;
+  virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
+  virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
+  virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE;
+  virtual void OnChildWindowVisibilityChanged(aura::Window* child,
+                                              bool visibile) OVERRIDE;
+  virtual void SetChildBounds(aura::Window* child,
+                              const gfx::Rect& requested_bounds) OVERRIDE;
+
+  // Overridden from ash::LauncherIconObserver
+  virtual void OnLauncherIconPositionsChanged() OVERRIDE;
+
+  // Overridden from ash::ShellObserver
+  virtual void OnShelfAlignmentChanged(aura::RootWindow* root_window) OVERRIDE;
+
+  // Overridden from aura::WindowObserver
+  virtual void OnWindowPropertyChanged(aura::Window* window,
+                                       const void* key,
+                                       intptr_t old) OVERRIDE;
+  virtual void OnWindowVisibilityChanged(aura::Window* window,
+                                         bool visible) OVERRIDE;
+
+  // Overridden from aura::client::ActivationChangeObserver
+  virtual void OnWindowActivated(aura::Window* gained_active,
+                                 aura::Window* lost_active) OVERRIDE;
+
+ private:
+  friend class PanelLayoutManagerTest;
+  friend class PanelWindowResizerTest;
+
+  views::Widget* CreateCalloutWidget();
+
+  struct PanelInfo{
+    PanelInfo() : window(NULL), callout_widget(NULL) {}
+
+    bool operator==(const aura::Window* other_window) const {
+      return window == other_window;
+    }
+
+    // A weak pointer to the panel window.
+    aura::Window* window;
+    // The callout widget for this panel. This pointer must be managed
+    // manually as this structure is used in a std::list. See
+    // http://www.chromium.org/developers/smart-pointer-guidelines
+    PanelCalloutWidget* callout_widget;
+  };
+
+  typedef std::list<PanelInfo> PanelList;
+
+  void MinimizePanel(aura::Window* panel);
+  void RestorePanel(aura::Window* panel);
+
+  // Called whenever the panel layout might change.
+  void Relayout();
+
+  // Called whenever the panel stacking order needs to be updated (e.g. focus
+  // changes or a panel is moved).
+  void UpdateStacking(aura::Window* active_panel);
+
+  // Update the callout arrows for all managed panels.
+  void UpdateCallouts();
+
+  // Parent window associated with this layout manager.
+  aura::Window* panel_container_;
+  // Protect against recursive calls to Relayout().
+  bool in_layout_;
+  // Ordered list of unowned pointers to panel windows.
+  PanelList panel_windows_;
+  // The panel being dragged.
+  aura::Window* dragged_panel_;
+  // The launcher we are observing for launcher icon changes.
+  Launcher* launcher_;
+  // The last active panel. Used to maintain stacking even if no panels are
+  // currently focused.
+  aura::Window* last_active_panel_;
+  base::WeakPtrFactory<PanelLayoutManager> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PanelLayoutManager);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_PANELS_PANEL_LAYOUT_MANAGER_H_