Reworks the workspace code. Here's the new heuristics:

ash/wm/show_state_controller.h

-// Copyright (c) 2011 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_SHOW_STATE_CONTROLLER_H_
-#define ASH_WM_SHOW_STATE_CONTROLLER_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "ui/aura/window_observer.h"
-
-namespace aura {
-class Window;
-}
-
-namespace ash {
-namespace internal {
-
-class WorkspaceManager;
-
-// ShowStateController controls the window's bounds when
-// the window's show state property has changed.
-class ShowStateController : public aura::WindowObserver {
-public:
-  explicit ShowStateController(WorkspaceManager* layout_manager);
-  virtual ~ShowStateController();
-
-  // aura::WindowObserver overrides:
-  virtual void OnWindowPropertyChanged(aura::Window* window,
-                                       const char* name,
-                                       void* old) OVERRIDE;
-
- private:
-  // |workspace_maanger_| is owned by |WorkspaceController|.
-  WorkspaceManager* workspace_manager_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShowStateController);
-};
-
-}  // namepsace internal
-}  // namepsace ash
-
-#endif  // ASH_WM_SHOW_STATE_CONTROLLER_H_