[ash-md] Makes sure that minimized windows can be activated in overview

ash/common/wm/overview/scoped_transform_overview_window.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_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 #define ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 123 matching lines @@
 
   WmWindow* window() const { return window_; }
 
   // Closes the transient root of the window managed by |this|.
   void Close();
 
   // Returns the window used to show the content in overview mdoe.
   // For minmiezd window, this will be a window that hosts mirrored layers.
   WmWindow* GetOverviewWindow() const;
 
+  // Ensures that a window is visible by setting its opacity to 1.
+  void EnsureVisible();
+
   // Returns the window created for minimized window, or nullptr
   // if it does not exit.
   WmWindow* GetOverviewWindowForMinimizedState() const;
 
   // ui::EventHandler:
   void OnGestureEvent(ui::GestureEvent* event) override;
   void OnMouseEvent(ui::MouseEvent* event) override;
 
  private:
   friend class WindowSelectorTest;
@@ skipping 32 matching lines @@
   std::unique_ptr<views::Widget> minimized_widget_;
 
   base::WeakPtrFactory<ScopedTransformOverviewWindow> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTransformOverviewWindow);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_