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

ash/wm/overview/window_selector_window.h

Index: ash/wm/overview/window_selector_window.h
diff --git a/ash/wm/overview/window_selector_window.h b/ash/wm/overview/window_selector_window.h
index 050ac9374246eee1038a7518d16515d056f4dfd3..7c28209c9d9dc919f280ff6b55f2e38656c7de87 100644
--- a/ash/wm/overview/window_selector_window.h
+++ b/ash/wm/overview/window_selector_window.h
@@ -5,76 +5,38 @@
 #ifndef ASH_WM_OVERVIEW_WINDOW_SELECTOR_WINDOW_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_WINDOW_H_
 
+#include "ash/wm/overview/scoped_transform_overview_window.h"
+#include "ash/wm/overview/window_selector_item.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/rect.h"
-#include "ui/gfx/transform.h"
 
 namespace aura {
 class RootWindow;
 class Window;
 }
 
-namespace ui {
-class Layer;
-}
-
-namespace views {
-class Widget;
-}
-
 namespace ash {
 
-// Manages a window in the overview mode. This class transitions the window
-// to the best fit within the available overview rectangle, copying it if the
-// window is sent to another display and restores the window state on
-// deletion.
-class WindowSelectorWindow {
+// This implements a window overview item with a single window which can be
+// selected.
+class WindowSelectorWindow : public WindowSelectorItem {
  public:
-  explicit WindowSelectorWindow(aura::Window* window);
+  WindowSelectorWindow(aura::Window* window);
   virtual ~WindowSelectorWindow();
 
-  aura::Window* window() { return window_; }
-  const aura::Window* window() const { return window_; }
-
-  // Returns true if this window selector window contains the |target|. This is
-  // used to determine if an event targetted this window.
-  bool Contains(const aura::Window* target) const;
-
-  // Restores this window on exit rather than returning it to a minimized state
-  // if it was minimized on entering overview mode.
-  void RestoreWindowOnExit();
-
-  // Informs the WindowSelectorWindow that the window being watched was
-  // destroyed. This resets the internal window pointer to avoid calling
-  // anything on the window at destruction time.
-  void OnWindowDestroyed();
-
-  // Applies a transform to the window to fit within |target_bounds| while
-  // maintaining its aspect ratio.
-  void TransformToFitBounds(aura::RootWindow* root_window,
-                            const gfx::Rect& target_bounds);
-
-  const gfx::Rect& bounds() { return fit_bounds_; }
+  // 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 SetItemBounds(aura::RootWindow* root_window,
+                             const gfx::Rect& target_bounds) OVERRIDE;
 
  private:
-  // A weak pointer to the real window in the overview.
-  aura::Window* window_;
-
-  // A copy of the window used to transition the window to another root.
-  views::Widget* window_copy_;
-
-  // A weak pointer to a deep copy of the window's layers.
-  ui::Layer* layer_;
-
-  // If true, the window was minimized and should be restored if the window
-  // was not selected.
-  bool minimized_;
-
-  // The original transform of the window before entering overview mode.
-  gfx::Transform original_transform_;
-
-  // The bounds this window is fit to.
-  gfx::Rect fit_bounds_;
+  ScopedTransformOverviewWindow transform_window_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorWindow);
 };