Dont allow the user to 'resize a window out of the workarea'

ash/wm/window_resizer.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_WINDOW_RESIZER_H_
 #define ASH_WM_WINDOW_RESIZER_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "ui/gfx/rect.h"
@@ skipping 12 matching lines @@
   // Constants to identify the type of resize.
   static const int kBoundsChange_None;
   static const int kBoundsChange_Repositions;
   static const int kBoundsChange_Resizes;
 
   // Used to indicate which direction the resize occurs in.
   static const int kBoundsChangeDirection_None;
   static const int kBoundsChangeDirection_Horizontal;
   static const int kBoundsChangeDirection_Vertical;
 
+  // Upon user resizing, at least this many pixels should remain visible on the
+  // screen to avoid 'loosing' the window.
+  static const int kMinimumOnScreenSize;
+
   WindowResizer();
   virtual ~WindowResizer();
 
   // Returns a bitmask of the kBoundsChange_ values.
   static int GetBoundsChangeForWindowComponent(int component);
 
   // Invoked to drag/move/resize the window. |location| is in the coordinates
   // of the window supplied to the constructor. |event_flags| is the event
   // flags from the event.
   virtual void Drag(const gfx::Point& location, int event_flags) = 0;
@@ skipping 74 matching lines @@
 
   // Returns the height of the drag.
   static int GetHeightForDrag(const Details& details,
                               int min_height,
                               int* delta_y);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_WINDOW_RESIZER_H_