ash: Refactor some code that snaps windows.

ash/wm/workspace/snap_sizer.h

 // Copyright (c) 2012 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_WORKSPACE_SNAP_SIZER_H_
 #define ASH_WM_WORKSPACE_SNAP_SIZER_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
@@ skipping 25 matching lines @@
 
   // Set |input_type| to |TOUCH_MAXIMIZE_BUTTON_INPUT| when called by a touch
   // operation by the maximize button. This will allow the user to snap resize
   // the window beginning close to the border.
   SnapSizer(aura::Window* window,
             const gfx::Point& start,
             Edge edge,
             InputType input_type);
   virtual ~SnapSizer();
 
+  // Snaps a window left or right.
+  static void SnapWindow(aura::Window* window, Edge edge);
+
   // Updates the target bounds based on a mouse move.
   void Update(const gfx::Point& location);
 
   // Bounds to position the window at.
   const gfx::Rect& target_bounds() const { return target_bounds_; }
 
   // Returns the appropriate snap bounds (e.g. if a window is already snapped,
   // then it returns the next snap-bounds).
   gfx::Rect GetSnapBounds(const gfx::Rect& bounds);
 
@@ skipping 62 matching lines @@
   // sizer gets created.
   const std::vector<int> usable_width_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapSizer);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_SNAP_SIZER_H_