Defer preparing for overview until all overview items are initialized.

ash/wm/overview/window_grid.h

 // Copyright 2014 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_GRID_H_
 #define ASH_WM_OVERVIEW_WINDOW_GRID_H_
 
 #include <vector>
 
 #include "ash/wm/overview/window_selector.h"
@@ skipping 33 matching lines @@
 //    0, 3, 6, 1, 4, 2, 5
 // The selector is switched to the next window grid (if available) or wrapped if
 // it reaches the end of its movement sequence.
 class ASH_EXPORT WindowGrid : public aura::WindowObserver {
  public:
   WindowGrid(aura::Window* root_window,
              const std::vector<aura::Window*>& window_list,
              WindowSelector* window_selector);
   virtual ~WindowGrid();
 
+  // Prepares the windows in this grid for overview. This will restore all
+  // minimized windows and ensure they are visible.
+  void PrepareForOverview();
+
   // Positions all the windows in the grid.
   void PositionWindows(bool animate);
 
   // Updates |selected_index_| according to the specified |direction| and calls
   // MoveSelectionWidget(). Returns |true| if the new selection index is out of
   // this window grid bounds.
   bool Move(WindowSelector::Direction direction);
 
   // Returns the target selected window, or NULL if there is none selected.
   WindowSelectorItem* SelectedWindow() const;
@@ skipping 62 matching lines @@
 
   // Number of columns in the grid.
   size_t num_columns_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowGrid);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_GRID_H_