Move some more WM functionality down into ash.

ui/aura_shell/default_container_event_filter.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 UI_AURA_SHELL_DEFAULT_CONTAINER_EVENT_FILTER_H_
-#define UI_AURA_SHELL_DEFAULT_CONTAINER_EVENT_FILTER_H_
-#pragma once
-
-#include "ui/aura_shell/toplevel_window_event_filter.h"
-
-namespace aura {
-class MouseEvent;
-class Window;
-}
-
-namespace aura_shell {
-namespace internal {
-
-class DefaultContainerEventFilter : public ToplevelWindowEventFilter {
- public:
-  explicit DefaultContainerEventFilter(aura::Window* owner);
-  virtual ~DefaultContainerEventFilter();
-
-  // Overridden from ToplevelWindowEventFilter:
-  virtual bool PreHandleMouseEvent(aura::Window* target,
-                                   aura::MouseEvent* event) OVERRIDE;
-
- private:
-  enum DragState {
-    DRAG_NONE,
-    DRAG_MOVE,
-    DRAG_RESIZE
-  };
-
-  // If the mouse is currently over a portion of the window that should
-  // trigger a drag or resize, drag_state_ is set appropriately and true
-  // is returned. If the mouse is not over a portion of the window that should
-  // trigger a more or resize, drag_state_ is not updated and false is returend.
-  bool UpdateDragState();
-
-  // Updates the top-level window under the mouse so that we can change
-  // the look of the caption area based on mouse-hover.
-  void UpdateHoveredWindow(aura::Window* toplevel);
-
-  DragState drag_state_;
-  // Top-level window under the mouse cursor.
-  aura::Window* hovered_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(DefaultContainerEventFilter);
-};
-
-}  // namespace internal
-}  // namespace aura_shell
-
-#endif  //  UI_AURA_SHELL_DEFAULT_CONTAINER_EVENT_FILTER_H_