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diff --git a/chrome/browser/ui/panels/stacked_panel_collection.h b/chrome/browser/ui/panels/stacked_panel_collection.h
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+++ b/chrome/browser/ui/panels/stacked_panel_collection.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_UI_PANELS_STACKED_PANEL_COLLECTION_H_
+#define CHROME_BROWSER_UI_PANELS_STACKED_PANEL_COLLECTION_H_
+
+#include <list>
+#include <vector>
+#include "base/basictypes.h"
+#include "chrome/browser/ui/panels/panel_collection.h"
+#include "ui/gfx/rect.h"
+
+class PanelManager;
+
+class StackedPanelCollection : public PanelCollection {
+ public:
+  typedef std::list<Panel*> Panels;
+
+  explicit StackedPanelCollection(PanelManager* panel_manager);
+  virtual ~StackedPanelCollection();
+
+  // PanelCollection OVERRIDES:
+  virtual void OnDisplayAreaChanged(const gfx::Rect& old_display_area) OVERRIDE;
+  virtual void RefreshLayout() OVERRIDE;
+  virtual void AddPanel(Panel* panel,
+                        PositioningMask positioning_mask) OVERRIDE;
+  virtual void RemovePanel(Panel* panel) OVERRIDE;
+  virtual void CloseAll() OVERRIDE;
+  virtual void ResizePanelWindow(
+      Panel* panel,
+      const gfx::Size& preferred_window_size) OVERRIDE;
+  virtual panel::Resizability GetPanelResizability(
+      const Panel* panel) const OVERRIDE;
+  virtual void OnPanelResizedByMouse(Panel* panel,
+                                     const gfx::Rect& new_bounds) OVERRIDE;
+  virtual void OnPanelAttentionStateChanged(Panel* panel) OVERRIDE;
+  virtual void OnPanelTitlebarClicked(Panel* panel,
+                                      panel::ClickModifier modifier) OVERRIDE;
+  virtual void ActivatePanel(Panel* panel) OVERRIDE;
+  virtual void MinimizePanel(Panel* panel) OVERRIDE;
+  virtual void RestorePanel(Panel* panel) OVERRIDE;
+  virtual void MinimizeAll() OVERRIDE;
+  virtual void RestoreAll() OVERRIDE;
+  virtual bool CanMinimizePanel(const Panel* panel) const OVERRIDE;
+  virtual bool IsPanelMinimized(const Panel* panel) const OVERRIDE;
+  virtual void SavePanelPlacement(Panel* panel) OVERRIDE;
+  virtual void RestorePanelToSavedPlacement() OVERRIDE;
+  virtual void DiscardSavedPanelPlacement()  OVERRIDE;
+  virtual void StartDraggingPanelWithinCollection(Panel* panel) OVERRIDE;
+  virtual void DragPanelWithinCollection(
+      Panel* panel,
+      const gfx::Point& target_position) OVERRIDE;
+  virtual void EndDraggingPanelWithinCollection(Panel* panel,
+                                                bool aborted) OVERRIDE;
+  virtual void ClearDraggingStateWhenPanelClosed() OVERRIDE;
+  virtual void UpdatePanelOnCollectionChange(Panel* panel) OVERRIDE;
+  virtual void OnPanelActiveStateChanged(Panel* panel) OVERRIDE;
+
+  Panel* GetPanelAbove(Panel* panel) const;
+  bool HasPanel(Panel* panel) const;
+
+  bool empty() const { return panels_.empty(); }
+  int num_panels() const { return panels_.size(); }
+  const Panels& panels() const { return panels_; }
+  Panel* top_panel() const { return panels_.front(); }
+  Panel* bottom_panel() const { return panels_.back(); }
+
+ private:
+  PanelManager* panel_manager_;  // Weak, owns us.
+
+  Panels panels_;  // The top panel is in the front of the list.
+
+  DISALLOW_COPY_AND_ASSIGN(StackedPanelCollection);
+};
+
+#endif  // CHROME_BROWSER_UI_PANELS_STACKED_PANEL_COLLECTION_H_