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

ash/wm/overview/window_selector.h

 // 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_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_
 
+#include <set>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/timer/timer.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/window_observer.h"
 
 namespace aura {
 class RootWindow;
 }
 
 namespace ui {
 class EventHandler;
 }
 
 namespace ash {
 
 namespace internal {
 class WindowSelectorTest;
 }
 
 class WindowOverview;
 class WindowSelectorDelegate;
-class WindowSelectorWindow;
+class WindowSelectorItem;
 
 // The WindowSelector allows selecting a window by alt-tabbing (CYCLE mode) or
 // by clicking or tapping on it (OVERVIEW mode). A WindowOverview will be shown
 // in OVERVIEW mode or if the user lingers on a window while alt tabbing.
 class ASH_EXPORT WindowSelector
     : public aura::WindowObserver,
       public aura::client::ActivationChangeObserver {
  public:
   enum Direction {
     FORWARD,
@@ skipping 42 matching lines @@
   // Begins positioning windows such that all windows are visible on the screen.
   void StartOverview();
 
   // Stores the currently focused window and removes focus from it.
   void RemoveFocusAndSetRestoreWindow();
 
   // Resets the stored window from RemoveFocusAndSetRestoreWindow to NULL. If
   // |focus|, restores focus to the stored window.
   void ResetFocusRestoreWindow(bool focus);
 
-  // The collection of windows in the overview wrapped by a helper class which
+  // The collection of items in the overview wrapped by a helper class which
   // restores their state and helps transform them to other root windows.
-  ScopedVector<WindowSelectorWindow> windows_;
+  ScopedVector<WindowSelectorItem> windows_;
+
+  // Tracks observed windows.
+  std::set<aura::Window*> observed_windows_;
 
   // The window selection mode.
   Mode mode_;
 
   // An event handler listening for the release of the alt key during alt-tab
   // cycling.
   scoped_ptr<ui::EventHandler> event_handler_;
 
   base::DelayTimer<WindowSelector> start_overview_timer_;
   scoped_ptr<WindowOverview> window_overview_;
@@ skipping 12 matching lines @@
   // True when restoring focus to the window. This is used to prevent handling
   // the resulting activation.
   bool restoring_focus_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelector);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_