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

ash/wm/window_resizer.h

Index: ash/wm/window_resizer.h
diff --git a/ash/wm/window_resizer.h b/ash/wm/window_resizer.h
index 67dea81e0bc896c939768e64a36f5be8ef2213b3..df8a5b4708eaee66cff31738d45b9e87e56a7974 100644
--- a/ash/wm/window_resizer.h
+++ b/ash/wm/window_resizer.h
@@ -30,6 +30,10 @@ class ASH_EXPORT WindowResizer {
   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();