[ash-md] Properly scales windows with transient parents in overview

ash/common/wm/overview/window_selector_item.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_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 #define ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 66 matching lines @@
 
   // Dispatched before beginning window overview. This will do any necessary
   // one time actions such as restoring minimized windows.
   void PrepareForOverview();
 
   // Calculates and returns an optimal scale ratio. With MD this is only
   // taking into account |size.height()| as the width can vary. Without MD this
   // returns the scale that allows the item to fully fit within |size|.
   float GetItemScale(const gfx::Size& size);
 
+  // Returns the union of the original target bounds of all transformed windows
+  // managed by |this| item, i.e. all regular (normal or panel transient
+  // descendants of the window returned by GetWindow()).
+  gfx::Rect GetTargetBoundsInScreen() const;
+
   // Sets the bounds of this window selector item to |target_bounds| in the
   // |root_window_| root window. The bounds change will be animated as specified
   // by |animation_type|.
   void SetBounds(const gfx::Rect& target_bounds,
                  OverviewAnimationType animation_type);
 
   // Activates or deactivates selection depending on |selected|.
   // Currently does nothing unless Material Design is enabled. With Material
   // Design the item's caption is shown transparent in selected state and blends
   // with the selection widget.
@@ skipping 119 matching lines @@
   // shape. This has performance implications so it can be disabled when there
   // are many windows.
   static bool use_shape_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_