Add panels as a single group of windows per display for overview window cycling.

ash/wm/overview/window_selector_panels.h

Index: ash/wm/overview/window_selector_panels.h
diff --git a/ash/wm/overview/window_selector_panels.h b/ash/wm/overview/window_selector_panels.h
new file mode 100644
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+++ b/ash/wm/overview/window_selector_panels.h
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+// 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 ASH_WM_OVERVIEW_WINDOW_SELECTOR_PANELS_H_
+#define ASH_WM_OVERVIEW_WINDOW_SELECTOR_PANELS_H_
+
+#include "ash/wm/overview/window_selector_item.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_vector.h"
+#include "ui/gfx/rect.h"
+
+namespace aura {
+class RootWindow;
+class Window;
+}
+
+namespace ash {
+
+class ScopedTransformOverviewWindow;
+
+// This class implements a window selector item containing one or more attached
+// panel windows. These panels are grouped into a single overview item in
+// overview mode and the callout arrows are hidden at this point.
+class WindowSelectorPanels : public WindowSelectorItem {
+ public:
+  WindowSelectorPanels();
+  virtual ~WindowSelectorPanels();
+
+  // Adds |window| to the selector item. This window should be an attached
+  // panel window.
+  void AddWindow(aura::Window* window);
+
+  // WindowSelectorItem:
+  virtual const aura::RootWindow* GetRootWindow() const OVERRIDE;
+  virtual aura::Window* TargetedWindow(
+      const aura::Window* target) const OVERRIDE;
+  virtual void RestoreWindowOnExit(aura::Window* window) OVERRIDE;
+  virtual aura::Window* SelectionWindow() const OVERRIDE;
+  virtual void RemoveWindow(const aura::Window* window) OVERRIDE;
+  virtual bool empty() const OVERRIDE;
+  virtual void SetBounds(aura::RootWindow* root_window,
+                         const gfx::Rect& target_bounds) OVERRIDE;
+
+ private:
+  typedef ScopedVector<ScopedTransformOverviewWindow> WindowList;
+  WindowList transform_windows_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowSelectorPanels);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_PANELS_H_