Implemented swipe to close in overview mode.

ash/wm/overview/window_selector_controller.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_CONTROLLER_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_CONTROLLER_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 30 matching lines @@
   // or touch rather than keypresses.
   void ToggleOverview();
 
   // Returns true if window selection mode is active.
   bool IsSelecting();
 
   // Returns true if overview mode is restoring minimized windows so that they
   // are visible during overview mode.
   bool IsRestoringMinimizedWindows() const;
 
+  bool swipe_to_close_disabled() const { return swipe_to_close_disabled_; }
+
   // WindowSelectorDelegate:
   void OnSelectionEnded() override;
 
  private:
   friend class WindowSelectorTest;
 
   // Dispatched when window selection begins.
   void OnSelectionStarted();
 
   scoped_ptr<WindowSelector> window_selector_;
   base::Time last_selection_time_;
 
+  // Tracks whether the "Swipe-to-close" feature is disabled.
+  bool swipe_to_close_disabled_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_CONTROLLER_H_